Abstract
The cytoplasmic protein content of endometrium from women at various times in the menstrual cycle has been examined by means of polyacrylamide gel electrophoresis using a double-label isotope technique. Analysis of the gels for altered label ratios suggests an increase in the concentration of a single protein band during the immediate postovulatory period that can be duplicated by the addition of progesterone to organ cultures of preovulatory endometrium. An alteration in the protein content is also observed in the same section of these gels when they are stained and scanned. The protein band of interest migrates on sodium dodecyl sulfate gels at a rate that establishes its approximate molecular weight as 51,500.
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