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Science. 1984 Feb 24;223(4638):816-8.

Human chorionic gonadotropin secreted by preimplantation embryos cultured in vitro.

Abstract

Human oocytes were collected by laparoscopy and fertilized and cultured in vitro. Human chorionic gonadotropin was detected in the medium surrounding two embryos cultured for more than 7 days after fertilization.

PMID:
6546453
[Indexed for MEDLINE]

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