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Response rates on the first cycle of weekly test sessions before (circles), during (triangles: pregnanolone last given 1 hr prior to session; squares: pregnanolone last given 25 hr prior to session), and after (diamonds) chronic pregnanolone treatment. Data points represent rates obtained on the first cycle of a single test session. Abscissa: week of chronic treatment. Ordinate: response rates (±SEM) expressed as number of responses per second.
