these antibodies reacted strongly with undifferentiated human ec cells in indirect radioimmunoassays ( ria ) and immunofluorescence ( if ) assays , but only weakly or not at all with cells derived from pluripotent ec cells differentiating in vitro or in xenograft tumors , nor with other germ cell tumor cell lines that did not also express the typical features of human ec cells .
C0017471
germ cell
C0206659
ec