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Day 13-16 pig conceptus tissue was cultured for 24 h in medium containing [3H]leucine. The patterns of radioactively labelled proteins that were released into the medium during culture were analysed by SDS-polyacrylamide gel electrophoresis and fluorography. Day-13 conceptuses released two major radiolabelled proteins of Mr 23 000 and 26 000 and Day 14-16 conceptuses released these as well as proteins of Mr 14 000, 19 000, 44 000, 50 000 and 88 000. Various immunological and biological tests for a human chorionic gonadotrophin-like activity were performed on tissue extracts and on culture medium, but there was no evidence for its presence in the pig conceptus at Day 13-16 of gestation.

reproduction

Pattern of medium proteins radiolabelled after culture of Day 13 to 16 pig conceptus tissue with [3H]leucine and absence of chorionic gonadotrophin-like activity