Low sex steroids, high steroid receptors: Increasing the sensitivity of the nonreproductive brain.

Abstract

Male aggressive behavior is generally regulated by testosterone (T). In most temperate breeding males, aggressive behavior is only expressed during the reproductive period. At this time circulating T concentrations, brain steroid receptors, and steroid metabolic enzymes are elevated in many species relative to the nonreproductive period. Many tropical birds… (More)

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