Abstract

The nature of major histocompatibility complex (MHC) antigen expression on rat placentas, trophoblast cell lines, and tumors derived from trophoblast cells was explored. Cytohistochemical and flow cytometric analysis and molecular techniques. MHC antigen expression and genomic imprinting on the placenta and on trophoblast cells varies with the time of gestation and with the type of MHC antigen. There is no correlation in trophoblast cells between class I expression and cell ploidy, on the one hand, and malignant potential, on the other hand. Genomic imprinting of class I antigens in the rat placenta is a quantitative phenomenon.

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