FIG. 1.

A timeline of human ovarian organogenesis from fertilization to birth indicating time points utilized to assess protein expression in whole ovarian tissue. The filled circles along the timeline represent samples used for immunofluorescence marker analysis, and the open triangles indicate samples used for proteomics analysis. Colored portions of the timeline indicate the trimesters of human fetal development: first-red, second-blue, and third-orange. LC-MS, liquid chromatography–mass spectrometry; PGC, primordial germ cell.