The GFP+ cells are found near the forming genital ridges. B) Section of ovary from a Day 7 hatchling immunostained for Scp3. Some GFP+ PGCs are positive for the meiotic marker, arrows. Bar, 50ìm C) Section of a seminiferous tubule for 16 week old male host. GFP+ cells are present and juxtaposed to the basement membrane. Scp3, red; Blue, nuclear stain. Bar, 100μm.