Fig. 4.
A, Oct4-HS-CRtg/+ blastocysts. Composite confocal image. Asterisks indicate ICM. Scale bar = 100 μm. B, C, Oct4-HS-RGtg/+ adult testis. Left panels, H2B-mCherry; center panels, EGFP-GPI; right panels, composite images. Scale bar = 50 μm. B, Seminiferous tubule containing round spermatids, expressing H2B-mCherry. C, Seminiferous tubule containing no spermatids. D, Seminiferous tubule from a non-transgenic adult male. E, Oct4-HS-RGtg/+ testis viewed under a stereofluorescence microscope. Left panel, H2B-mCherry; right panel, EGFP-GPI. Subregions of the seminiferous tubules express mCherry, whereas all regions express EGFP.