immunohistochemical assays of early and mature placental tissue sections , indirect immunofluorescence labelling of placental cultures and blastocyst outgrowths in vitro , and immunoprecipitation of 35s-labelled np-40 extracts of placental cultures indicate the presence of a plasma membrane-associated antigen with the same characteristics as ma21 antigen of peri-implantation embryos and f9 teratocarcinoma cells .
C0007603
plasma membrane
C0007634
cells