Which of the following are NOT triggers of second-messenger events?
A) B-complex vitamins
B) Retinoids
C) Steroid agents
D) Hormones
A) B-complex vitamins
B-complex vitamins are not triggers of second-messenger events. Once bound to a receptor, a drug may trigger these events inside cells. Examples include release of intracellular calcium, activation of enzymes and specific G proteins, and conversion of adenosine triphosphate (ATP) to cyclic adenosine monophosphate (cyclic AMP). The agents that bind intracellular components include hormones, steroid medications, retinoids, and vitamin D.
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