G_i proteins: G_i1α, G_i2α, and G_i3α

G_o protein: G_oα (in mouse there is alternative splicing to generate G_o1α and G_o2α)

G_z protein: G_zα

(G_t proteins): G_t1α, G_t2α, G_t3α

Transducins

M₂ & M₄ receptors

Acetylcholine

A₁ & A₃ receptors

Adenosine

α_2A, α_2B, & α_2C receptors

Adrenergic

receptors

Apelin

Calcium-sensing receptor

(CB1 and CB2^[6])

Cannabinoid receptors

CXCR4 receptor

Chemokine

D₂, D₃, D₄

Dopamine

receptor

GABA_B

mGlu₂, mGlu₃, mGlu₄, mGlu₆, mGlu₇, & mGlu₈ receptors

Glutamate

H₃ & H₄ receptors

Histamine

MT₁, MT₂, & MT₃ receptors

Melatonin

: HCA1, HCA2, & HCA3

Hydroxycarboxylic acid receptors

δ, κ, μ, & nociceptin receptors

Opioid

EP₁, EP₃, FP, & TP receptors

Prostaglandin

5-HT₁ & 5-HT₅ receptors

Serotonin

receptors: FFAR2 & FFAR3

Short chain fatty acid

sst1, sst2, sst3, sst4 & sst5 receptors

Somatostatin

Trace amine-associated receptor 8

Second messenger system

G protein-coupled receptor

Heterotrimeric G protein

Adenylyl cyclase

Protein kinase A

Gs alpha subunit

Gq alpha subunit

G12/G13 alpha subunits

Retina

Taste

at the U.S. National Library of Medicine Medical Subject Headings (MeSH)

Gi+alpha+Subunit