[Comparative gel-electrophoretic study of soluble human endometrial and decidual proteins]

As shown by polyacrylamide gel disc electrophoresis, 21 fractions of soluble proteins were found in human endometrium at the proliferative step, whereas the decidual tissue contained only 13 fractions. Two specific protein components D1 and D2 with molecular weight 52,000 and 150,000 daltons, respectively, were observed in the cytosol of decidual tissue. The decrease in quantitative spectrum of soluble proteins from decidual tissue was apparently related to its narrow specialization during the differentiation process.