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Rap1 signals showed multiple localizations during murine spermiogenesis. From left to right: bright field (BF), DAPI staining (blue), and Rap1 signal (green), as well as the merging of Rap1 and DAPI at early elongation (A), late elongation (B), early elongated spermatids (C), and mature sperm (D). Arrows indicate Rap1 signals. Scale bar: 5 μm.
