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Although hormonal response abnormalities in depression have been demonstrated in several hypothalamic-pituitary-target organ axes after a variety of neuroendocrine challenge tests, studies of hypothalamic-pituitary-gonadal (HPG) axis function have been inconsistent in their findings. The use of maximal or supramaximal doses of gonadotropin-releasing hormone (GnRH) in early studies (150-600 μg) may...