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More than 1.0ƒÊg of 20ƒ¿-hydroxypregn-4-en-3-one and progesterone in the ovarian vein blood of rabbits can be quantitatively determined with a new chromatographic system using a partially esterified carboxylic acid type ion exchange resin, Amberlite IRC-50, and a mixture of ethanol and water (3:2 v/v) used as stationary phase and moving phase respectively. Before administration of human chorionic gonadotropin

PROGESTINS IN THE OVARIAN VEIN BLOOD OF NONPREGNANT AND PREGNANT RABBITS BEFORE AND AFTER GONADOTROPIC STIMULATION