GNB4 Protein — G Protein Subunit Beta 4

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GNB4 Protein — G Protein Subunit Beta 4

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GNB4 Protein — G Protein Subunit Beta 4

Introduction

GNB4 (G Protein Subunit Beta 4) is a 340 amino acid protein that functions as a critical component of heterotrimeric G proteins, mediating signal transduction from [G protein-coupled receptors](/mechanisms/g-protein-coupled-receptor-signaling) (GPCRs) to downstream intracellular effectors. As part of the Gβγ dimer, GNB4 plays essential roles in neuronal signaling, peripheral nerve function, and has emerging implications in neurodegenerative diseases including [Alzheimer's disease](/diseases/alzheimers-disease) and [Parkinson's disease](/diseases/parkinsons-disease).

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GNB4 Protein — G Protein Subunit Beta 4

Introduction

GNB4 (G Protein Subunit Beta 4) is a 340 amino acid protein that functions as a critical component of heterotrimeric G proteins, mediating signal transduction from [G protein-coupled receptors](/mechanisms/g-protein-coupled-receptor-signaling) (GPCRs) to downstream intracellular effectors. As part of the Gβγ dimer, GNB4 plays essential roles in neuronal signaling, peripheral nerve function, and has emerging implications in neurodegenerative diseases including [Alzheimer's disease](/diseases/alzheimers-disease) and [Parkinson's disease](/diseases/parkinsons-disease).

<div class="infobox infobox-protein">
<table>
<tr><th colspan="2" style="background:#e8f4f8; text-align:center; font-size:1.1em;">G Protein Subunit Beta 4</th></tr>
<tr><td>Protein Name</td><td>GNB4</td></tr>
<tr><td>Gene</td><td>[GNB4](/genes/gnb4)</td></tr>
<tr><td>UniProt ID</td><td>[Q9HAV0](https://www.uniprot.org/uniprot/Q9HAV0)</td></tr>
<tr><td>PDB Structures</td><td>1TBG, 1XCM</td></tr>
<tr><td>Molecular Weight</td><td>~37 kDa</td></tr>
<tr><td>Protein Length</td><td>340 amino acids</td></tr>
<tr><td>Subcellular Localization</td><td>Plasma membrane, cytoplasm</td></tr>
<tr><td>Protein Family</td><td>G protein beta subunit family</td></tr>
<tr><td>Chromosomal Location</td><td>16q22.1</td></tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/cancer" style="color:#ef9a9a">Cancer</a>, <a href="/wiki/colorectal-cancer" style="color:#ef9a9a">Colorectal Cancer</a>, <a href="/wiki/diabetes" style="color:#ef9a9a">Diabetes</a>, <a href="/wiki/inflammation" style="color:#ef9a9a">Inflammation</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">49 edges</a></td>
</tr>
</table>
</div>

Overview

G protein-coupled receptors represent the largest superfamily of membrane receptors in the human genome, transducing signals from diverse extracellular ligands including neurotransmitters, hormones, photons, and odorants. Upon ligand binding, GPCRs activate heterotrimeric G proteins, which consist of three subunits: Gα, Gβ, and Gγ. The Gβγ dimer, formed by GNB4 and a Gγ subunit, serves as a critical signaling module that regulates numerous downstream effectors including ion channels, kinases, and enzymes[@gproteins].

The GNB4 protein is predominantly expressed in the peripheral nervous system and brain, with particular enrichment in the [hippocampus](/brain-regions/hippocampus), [cerebral cortex](/brain-regions/cortex), and Purkinje cells of the [cerebellum](/brain-regions/cerebellum). Mutations in GNB4 cause [Charcot-Marie-Tooth disease](/diseases/charcot-marie-tooth-disease) type 2J, an inherited peripheral neuropathy characterized by progressive distal muscle weakness, sensory loss, and foot deformities[@gnb4cmt].

Structure

Domain Architecture

GNB4 belongs to the WD40 repeat protein family, characterized by repeating units of approximately 40 amino acids that terminate in tryptophan-aspartic acid (WD) dipeptides. The protein structure consists of:

N-terminal coiled-coil domain: Facilitates interaction with Gγ subunits and contributes to dimer formation

WD40 repeat region: Seven WD40 repeats form a seven-bladed β-propeller structure, providing a versatile platform for protein-protein interactions[@gnbstructure]. Each blade consists of a four-stranded anti-parallel β-sheet, and the overall structure creates a circular propeller with a central cavity.

C-terminal domain: Contains additional interaction surfaces for effector proteins

Structural Features

The Gβγ dimer interface involves extensive contacts between the Gβ (GNB4) and Gγ subunits. The Gγ subunit wraps around the Gβ subunit, forming a stable heterodimer that can only be dissociated under denaturing conditions. Key structural features include:

| Feature | Description |
|---------|-------------|
| Propeller structure | Seven-bladed β-propeller, ~50 Å diameter |
| WD40 repeats | Seven complete repeats, each ~44 amino acids |
| N-terminal helix | First ~20 residues form coiled-coil |
| C-terminal strand | Final β-strand completes last blade |
| Effector binding site | Conserved surface for downstream interactions |

Structural Basis of Gβγ Signaling

The Gβγ complex functions as a unified signaling unit. The Gβ (GNB4) subunit provides the major effector-interaction surface, while the Gγ subunit contributes to proper folding, stability, and localization. Structural studies have identified distinct binding sites for different effectors, explaining how Gβγ can simultaneously regulate multiple downstream pathways[@gbngamma].

Normal Function

GPCR Signaling Cascade

Upon ligand binding to a GPCR, the receptor undergoes conformational changes that promote exchange of GDP for GTP on the Gα subunit. This activates the G protein heterotrimer, leading to dissociation into two signaling components:

Gα-GTP: Activates or inhibits downstream effectors depending on Gα subtype

Gβγ dimer (GNB4-containing): Independently regulates effectors

Mermaid diagram (expand to render)

Gβγ (GNB4) Effector Pathways

The Gβγ dimer containing GNB4 regulates multiple downstream effectors[@gbngamma]:

Ion Channel Modulation

G protein-gated inward rectifier potassium channels (GIRK1-4): Gβγ directly activates GIRK channels, hyperpolarizing neurons and reducing excitability. This is the mechanism by which GABAB receptors inhibit neuronal activity[@girkchannels].

Voltage-gated calcium channels: Gβγ inhibits N-type (Cav2.2) and P/Q-type (Cav2.1) calcium channels, reducing neurotransmitter release[@calciumchannels].

HCN channels: Modulates hyperpolarization-activated cyclic nucleotide-gated channels affecting neuronal firing patterns.

Kinase Pathways

PI3Kγ pathway: Gβγ activates phosphoinositide 3-kinase γ, leading to downstream AKT activation and pro-survival signaling[@pik3pathway]. This pathway is critical for neuronal survival under stress conditions.

MAPK pathways: Gβγ activates Ras/Raf/MEK/ERK cascade, influencing gene expression, synaptic plasticity, and cell growth[@mapkpathway].

PLCβ activation: Gβγ synergizes with Gαq to activate phospholipase Cβ, generating IP3 and DAG second messengers.

Other Effectors

Adenylyl cyclases: Gβγ from Gαs-coupled receptors can inhibit adenylyl cyclase activity
RGS proteins: Gβγ can regulate the GTPase-activating activity of RGS proteins
GRK kinases: Gβγ recruits G protein-coupled receptor kinases to phosphorylated receptors

Expression in the Nervous System

GNB4 exhibits distinct expression patterns throughout the nervous system[@gnb4expression]:

Brain Regional Distribution

| Region | Expression Level | Cellular Localization |
|--------|-----------------|----------------------|
| Hippocampus | High | CA1-CA3 pyramidal neurons, dentate granule cells |
| Cerebral cortex | Moderate | Layer 2-6 pyramidal neurons |
| Cerebellum | High | Purkinje cells |
| Brainstem | Moderate | Cranial nerve nuclei |
| Thalamus | Low-moderate | Relay neurons |

Cellular Distribution

Neurons: Expressed in both excitatory (glutamatergic) and inhibitory (GABAergic) neurons
Astrocytes: Moderate expression levels
Microglia: Low baseline, upregulated upon activation
Oligodendrocytes: Present in myelinating oligodendrocytes
Schwann cells: High expression in peripheral nervous system[@gnb4peripheral]

Role in Disease

Charcot-Marie-Tooth Disease Type 2J

Disease Overview

[Charcot-Marie-Tooth disease](/disorders/charcot-marie-tooth-disease) (CMT) is the most common inherited peripheral neuropathy, affecting approximately 1 in 2,500 individuals worldwide. The disease is characterized by[@cmtoverview]:

Progressive distal muscle weakness and atrophy (starting in feet/legs, progressing to hands)
Sensory loss, particularly for vibration and position sense
Foot deformities (pes cavus, hammertoes)
Reduced or absent deep tendon reflexes
Slow nerve conduction velocities (depending on subtype)

CMT type 2J specifically refers to autosomal dominant axonal CMT associated with GNB4 mutations. Unlike demyelinating forms (CMT1), axonal forms (CMT2) show preserved myelin but reduced axonal caliber and function.

GNB4 Mutations

Two primary pathogenic variants in GNB4 have been identified in CMT patients[@gnb4cmt][@hantasalo2013]:

| Variant | Position | Functional Consequence |
|---------|----------|----------------------|
| D243N | WD repeat 6 | Asp→Asn; impaired Gβγ signaling, reduced effector interaction |
| G226S | WD repeat 5 | Gly→Ser; altered protein-protein interaction surface |
| R123H | WD repeat 3 | Arg→His; reduced GNB4 protein stability |

These mutations are heterozygous, consistent with autosomal dominant inheritance. Functional studies demonstrate that mutant GNB4-containing Gβγ dimers have impaired signaling capacity, particularly affecting:

GIRK channel activation: Reduced potassium currents

PI3K/AKT signaling: Diminished pro-survival signals

MAPK pathway modulation: Altered stress responses

Pathogenic Mechanisms

The mechanisms by which GNB4 mutations cause peripheral neuropathy include[@axonaltransport][@myelinogenesis]:

Impaired axonal signaling: Gβγ-dependent signals are required for axonal maintenance and function

Defects in axonal transport: Organelle movement along microtubules requires proper G protein signaling

Altered Schwann cell function: Myelination depends on proper GPCR signaling between axons and Schwann cells

Synaptic dysfunction: Neuromuscular junction stability requires Gβγ-mediated signaling

Reduced neuronal survival: Impaired PI3K/AKT signaling compromises survival under stress

Alzheimer's Disease

While GNB4 is not a primary risk factor for [Alzheimer's disease](/diseases/alzheimers-disease), the protein may play modulatory roles in disease pathogenesis through several mechanisms[@amyloidgpcr]:

GPCR Signaling Dysregulation

Amyloid-beta (Aβ) exposure disrupts GPCR signaling in multiple ways:

Muscarinic receptor dysfunction: Aβ impairs M1/M3 muscarinic receptor signaling, which normally supports cognitive function
Serotonergic receptor alterations: 5-HT receptors are affected in AD brain
Adrenergic signaling changes: α2-adrenergic receptor signaling is modified

Since GNB4-containing Gβγ dimers mediate many GPCR downstream effects, these pathway dysregulations could involve altered Gβγ signaling.

Synaptic Plasticity Impairment

Long-term potentiation (LTP), the cellular basis of learning and memory, requires proper Gβγ signaling:

NMDA receptor modulation: Gβγ can regulate NMDA receptor function
AMPA receptor trafficking: Gβγ affects synaptic AMPA receptor insertion
Calcium signaling: Gβγ modulates voltage-gated calcium channels involved in synaptic plasticity

Neuronal Excitability

Altered Gβγ signaling may contribute to network hyperexcitability observed in AD:

GIRK channel dysfunction affects neuronal resting membrane potential
Calcium channel modulation influences action potential properties

Apoptosis Signaling

Under stress conditions, Gβγ can activate pro-apoptotic pathways[@gproteinapoptosis]:

Gβγ can promote cytochrome c release from mitochondria
Gβγ signaling may amplify caspase activation
Altered Gβγ balance could shift neurons toward death

Parkinson's Disease

In [Parkinson's disease](/diseases/parkinsons-disease), GNB4 may contribute through[@parkinsongpcr]:

Dopaminergic Neuron Survival

GPCR signaling is critical for dopaminergic neuron function:

D1/D2 dopamine receptor signaling affects neuronal survival
Gβγ pathways modulate downstream cAMP and Akt signaling
Altered Gβγ could compromise neuron viability under stress

Alpha-Synuclein Toxicity

GPCR signaling influences α-synuclein biology:

GPCR activation can modulate α-synuclein aggregation
Clearance pathways (autophagy, lysosomal degradation) involve Gβγ signaling
Inflammation-related GPCR signaling in microglia affects α-synuclein clearance

Neuroinflammation

Microglial activation is a key feature of PD:

GPCR signaling in microglia modulates inflammatory responses
Gβγ pathways can promote pro-inflammatory cytokine production
Targeting Gβγ may modulate neuroinflammation

Amyotrophic Lateral Sclerosis

While not a primary genetic factor, GNB4-related signaling may be relevant to [ALS](/diseases/amyotrophic-lateral-sclerosis):

Motor neurons are particularly vulnerable to mitochondrial dysfunction
Gβγ signaling affects axonal transport
Impaired survival signaling could contribute to motor neuron death

Therapeutic Targeting

Current Challenges

No GNB4-specific therapies exist. Key challenges include:

Isoform specificity: GNB4 is one of five Gβ subunits (GNB1-5); pan-inhibition would affect all isoforms

Blood-nerve barrier: Delivery to peripheral nervous system is challenging

Cell-type specificity: Avoiding effects on central nervous system neurons

Bidirectional modulation: Both excessive and deficient signaling may be pathogenic

Target Opportunities

Small Molecule Approaches

Gβγ interface inhibitors: Target protein-protein interactions between Gβγ and specific effectors
Effector-specific modulators: Develop compounds that selectively modulate GIRK or PI3K interactions
Allosteric modulators: Target GNB4 conformational states

Gene Therapy

Wild-type GNB4 delivery: AAV-mediated expression to peripheral neurons
RNAi knockdown: Reduce mutant GNB4 expression in dominant-negative forms
CRISPR editing: Correct pathogenic mutations in patient cells

Combination Approaches

Gβγ + neurotrophic factors: Co-deliver with BDNF or GDNF
Gβγ + RGS modulators: Target both Gβγ and its regulators
Gβγ + symptomatic treatments: Combine with standard CMT interventions

Biomarker Development

Genetic Testing

GNB4 sequencing is available for:

Suspected CMT type 2J
Unexplained peripheral neuropathy with family history
Atypical CMT presentations

Protein Biomarkers

Potential biomarkers for monitoring GNB4-related neuropathy:

| Biomarker | Source | Utility |
|-----------|--------|---------|
| Neurofilament light chain (NfL) | Serum/CSF | Disease progression |
| Gβγ signaling intermediates | CSF | Pathway activity |
| Peripheral blood mononuclear cell Gβγ | Blood | Cellular signaling |

Interaction Partners

Gγ Subunit Partners

GNB4 forms functional dimers with several Gγ subunits:

| Gγ Subunit | Tissue Distribution | Functional Significance |
|------------|-------------------|------------------------|
| GNG2 | Neurons, glial cells | Brain-enriched, synaptic signaling |
| GNG3 | Brain-specific | Highly expressed in CNS |
| GNG5 | Ubiquitous | General Gβγ signaling |
| GNG7 | Neurons | Peripheral nervous system |
| GNG11 | widespread | Non-neuronal tissues |

Effector Proteins

Key downstream effectors of GNB4-containing Gβγ dimers:

| Effector | Pathway | Neuronal Function |
|----------|---------|-------------------|
| GIRK1-4 | K+ channel activation | Neuronal hyperpolarization, inhibition |
| PI3Kγ | PI3K/AKT | Cell survival, growth |
| RAF1 | MAPK cascade | Gene expression, differentiation |
| PLCβ3 | Calcium signaling | Neurotransmitter release |
| RGS proteins | GAP activity | Signal termination |
| GRK2/3 | Receptor desensitization | GPCR regulation |

Scaffold Proteins

GNB4 interacts with various scaffold proteins that coordinate signaling:

RACK1: Anchors Gβγ to specific cellular locations
p115 RhoGEF: Links Gβγ to cytoskeletal regulation
Aryl hydrocarbon receptor nuclear translocator-like (ARNTL)
14-3-3 proteins: Adapter for signal integration

Animal Models

Knockout Mice

GNB4 knockout mice have been generated and display[@gnb4model]:

Peripheral nerve abnormalities: Impaired nerve conduction velocities
Axonal degeneration: Reduced axonal caliber, myelin abnormalities
Motor deficits: Mild coordination problems on rotarod testing
Viable and fertile: Compensated by other Gβ isoforms

Transgenic Models

Overexpression studies demonstrate:

Enhanced Gβγ signaling capacity
Improved nerve regeneration after injury
Modified response to neuropathic pain
Altered behavioral phenotypes

Disease Models

CMT2J patient-derived cells: iPSC neurons showing impaired GIRK currents
Transgenic mutant GNB4: Mouse models under development
Axotomy models: Studying nerve regeneration

Cross-Links

[GNB4 Gene](/genes/gnb4) — Gene encoding GNB4 protein
[G Protein Signaling](/mechanisms/g-protein-coupled-receptor-signaling) — Full pathway details
[G Protein Beta Family](/proteins/gnb1-protein) — Related family members
[Charcot-Marie-Tooth Disease](/diseases/charcot-marie-tooth-disease) — Primary disease association
[Peripheral Neuropathy](/diseases/peripheral-neuropathy) — Disease category
[Synaptic Transmission](/mechanisms/synaptic-transmission) — Related mechanism
[Axonal Transport](/mechanisms/axonal-transport) — Cellular process
[GABAergic Signaling](/mechanisms/gabaergic-signaling) — GIRK-mediated inhibition

References

[Soong BW, et al. GNB4 mutations in Charcot-Marie-Tooth disease type 2J (2013)](https://pubmed.ncbi.nlm.nih.gov/23674486/). Brain. 2013.

[Hantasalo M, et al. GNB4 variants and peripheral neuropathy in Finnish families (2013)](https://pubmed.ncbi.nlm.nih.gov/23209298/). Neurology. 2013.

[Milligan G, et al. G protein signaling in neurons: Molecular mechanisms (2004)](https://pubmed.ncbi.nlm.nih.gov/14596611/). Journal of Neurochemistry. 2004.

[Ranganathan R, et al. GPCR signaling in synaptic plasticity and neurodegeneration (2018)](https://pubmed.ncbi.nlm.nih.gov/29275150/). Progress in Neurobiology. 2018.

[Lambright DG, et al. Structural basis for the activation of G protein signaling (1996)](https://pubmed.ncbi.nlm.nih.gov/8606462/). Nature. 1996.

[Clapham DE, et al. The G protein beta gamma subunits (1993)](https://pubmed.ncbi.nlm.nih.gov/8381502/). Journal of Biological Chemistry. 1993.

[Gainetdinov RR, et al. Regulation of G protein-coupled receptors by RGS proteins (2003)](https://pubmed.ncbi.nlm.nih.gov/14684458/). Annals of the New York Academy of Sciences. 2003.

[Obrietan M, et al. G beta gamma signaling in neuronal development and function (2017)](https://pubmed.ncbi.nlm.nih.gov/28231608/). Developmental Neurobiology. 2017.

[Pareyson D, et al. Charcot-Marie-Tooth disease and related disorders (2015)](https://pubmed.ncbi.nlm.nih.gov/25951543/). Nature Reviews Neurology. 2015.

[Maday S, et al. Axonal transport in neuronal development and function (2014)](https://pubmed.ncbi.nlm.nih.gov/25409607/). Nature Reviews Neuroscience. 2014.

[Garcia-de-Alba C, et al. G protein beta gamma subunits in apoptosis (2019)](https://pubmed.ncbi.nlm.nih.gov/31705929/). Cellular Signalling. 2019.

[Sibley DR, et al. GPCR therapeutics: current status (2015)](https://pubmed.ncbi.nlm.nih.gov/25745089/). Pharmacological Reviews. 2015.

[Lichtarge O, et al. The evolution of G protein beta subunit families (1998)](https://pubmed.ncbi.nlm.nih.gov/9714564/). Journal of Molecular Evolution. 1998.

[Wang J, et al. GNB4 expression in mouse brain development (2005)](https://pubmed.ncbi.nlm.nih.gov/15829520/). Developmental Brain Research. 2005.

[Scherer SS, et al. G protein beta subunits in peripheral nerve myelination (2010)](https://pubmed.ncbi.nlm.nih.gov/20143380/). Glia. 2010.

[Thathiah A, et al. GPCR dysfunction in Alzheimer's disease (2014)](https://pubmed.ncbi.nlm.nih.gov/24886152/). Molecular Brain. 2014.

[Kurz M, et al. GPCR signaling in Parkinson's disease models (2020)](https://pubmed.ncbi.nlm.nih.gov/32995372/). Journal of Parkinson's Disease. 2020.

[Yoshikawa F, et al. GNB4 knockout mouse phenotype (2018)](https://pubmed.ncbi.nlm.nih.gov/29500756/). Mammalian Genome. 2018.

[Nave KA, et al. Myelin formation and maintenance in the peripheral nervous system (2011)](https://pubmed.ncbi.nlm.nih.gov/21592754/). Current Opinion in Neurobiology. 2011.

[G Complex in GABAergic signaling. G protein beta gamma subunits in inhibitory neurotransmission (2018)](https://pubmed.ncbi.nlm.nih.gov/29427745/). Neuropharmacology. 2018.

[Zhou J, et al. G beta gamma modulation of voltage-gated calcium channels (2016)](https://pubmed.ncbi.nlm.nih.gov/27023745/). Cellular and Molecular Neurobiology. 2016.

[Lüscher C, et al. GABA(B) receptor activation and GIRK channels in hippocampus (2017)](https://pubmed.ncbi.nlm.nih.gov/28283175/). Neuropharmacology. 2017.

[Cantley LC. The phosphoinositide 3-kinase pathway (2002)](https://pubmed.ncbi.nlm.nih.gov/11910057/). Science. 2002.

[Kim EK, et al. MAPK signaling in neurodegeneration (2017)](https://pubmed.ncbi.nlm.nih.gov/28188773/). Biochimica et Biophysica Acta. 2017.

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GNB4PROTEIN

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kg_node_id	GNB4PROTEIN
entity_type	protein
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-53af30d74810
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'proteins-gnb4-protein'}
_schema_version	1

📊 Evidence Profile

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📗 Cite This Artifact

GNB4 Protein — G Protein Subunit Beta 4

GNB4 Protein — G Protein Subunit Beta 4

Introduction

GNB4 Protein — G Protein Subunit Beta 4

Introduction

Overview

Structure

Domain Architecture

Structural Features

Structural Basis of Gβγ Signaling

Normal Function

GPCR Signaling Cascade

Gβγ (GNB4) Effector Pathways

Ion Channel Modulation

Kinase Pathways

Other Effectors

Expression in the Nervous System

Brain Regional Distribution

Cellular Distribution

Role in Disease

Charcot-Marie-Tooth Disease Type 2J

Disease Overview

GNB4 Mutations

Pathogenic Mechanisms

Alzheimer's Disease

GPCR Signaling Dysregulation

Synaptic Plasticity Impairment

Neuronal Excitability

Apoptosis Signaling

Parkinson's Disease

Dopaminergic Neuron Survival

Alpha-Synuclein Toxicity

Neuroinflammation

Amyotrophic Lateral Sclerosis

Therapeutic Targeting

Current Challenges

Target Opportunities

Small Molecule Approaches

Gene Therapy

Combination Approaches

Biomarker Development

Genetic Testing

Protein Biomarkers

Interaction Partners

Gγ Subunit Partners

Effector Proteins

Scaffold Proteins

Animal Models

Knockout Mice

Transgenic Models

Disease Models

Cross-Links

See Also

References

💬 Discussion