Abstract
Summary
Ovaries of starfish (Pisaster ochraceous) were examined for sex steroids. A low level of estrogenic activity, approximately 0.1 μg or less/kg of ovarian tissue, was determined by the Astwood 6 hour assay method. The biologically active material was identified as estradiol 17β by countercurrent distribution, paper chromatography and bioassay. Presence of progesterone was tentatively identified by methods of column chromatography and Hooker-Forbes assay.
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