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Antisera raised against the soluble antigens of the endometrium of early pregnancy detected two antigenic proteins of \g=a\1 and \ g=a\ 2 mobility in extracts of this tissue and were termed antigens A and B. Neither antigen was detected in pregnancy sera or extracts of proliferative endometrium, but antigen B was detected in extracts of secretory endometrium and both were present in amniotic fluid and medium from i n\ x=r eq-\ vitro incubations of pregnancy endometrium. Fractionation ofdoi:10.1530/jrf.0.0740261 pmid:2410613 fatcat:savp5nhlrrgqlj5bk7t7ijuw5u