Alpha measures a manager's skill in adding value to a portfolio beyond market gains. Beta assesses how a stock or fund's volatility compares to the market average. High alpha and low beta indicate ...

Beta-blockers are thought to cause “unopposed alpha receptor agonism.” Since the beta receptors would be occupied by the beta-blockers, substances (epinephrine, norepinephrine, etc.) ...

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).

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 ...