G-protein coupled receptors regulate hormone secretions ... Within islets, beta cells secrete insulin, and alpha cells secrete glucagon. Scientists have identified three additional cell types ...

In unstimulated cells, the state of G alpha (orange circles) is defined by its interaction with GDP, G beta-gamma (purple circles), and a G-protein-coupled receptor (GPCR; light green loops).

Epinephrine 0.15mg (1:2000); prefilled auto-injector; contains sulfites. Epinephrine acts on both alpha- and beta-adrenergic receptors. Through its action on alpha-adrenergic receptors ...

Compared to other forms of radioactive emissions (beta and gamma emissions), alpha particles are heavier ... to specifically ...