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Chappell PE, Schneider JS, Kim P, Xu M, Lydon JP, O'Malley BW, Levine JE.? 1999.??Absence of gonadotropin surges and gonadotropin-releasing hormone self-priming in ovariectomized (OVX), estrogen (E2)-treated, progesterone receptor knockout (PRKO) mice.. Endocrinology. 140(8):3653-8.\par \par }