Abstract
Monoclonal antibody 75.12 raised against the human ovarian teratocarcinoma cell line PA1 detects a 'Y' or iso-leb glycosidic structure. Using the 75.12 antibody we have established that the Y antigen is expressed on some but not all mouse embryonal carcinoma (EC) lines. The Y or 75.12 antigen-positive EC cell lines F9 and PCC4 cease to express the antigen after differentiation induced with retinoic acid and this decreased expression parallels the morphological differentiation of the EC cells. These results support not only the idea that carbohydrate structures present on embryonic cells undergo marked alteration during differentiation, but also that established mouse EC cells may differ in their differentiation states.
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