What is the definition of a prohormone?
A. A longer protein or peptide that is cleaved into shorter ones, at least one of which is a peptide or protein hormone
B. Hormones that bind to endocrine glands and inhibit the secretion of a second hormone
C. Hormones that bind to endocrine glands and stimulate the secretion of a second hormone
D. Hormones that stimulate the expression of receptors for a second hormone, promoting their action
E. Steroid hormones that are inactivated by having hydroxyl groups removed from their structure
Answer: A
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