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TBC1D21 signals showed multiple localizations during murine spermiogenesis. From left to right: Bright field (BF), DAPI staining (blue), and TBC1D21 signal (green), as well as the merging of TBC1D21 and DAPI at early elongation (A) and late elongation (B), early elongated spermatids (C), and mature sperm (D). Arrows indicate TBC1D21 signals. Scale bar: 5 μm.
