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Immunogold detection of CRT at stages V (a) and VIII (b) of C. vulgaris spermiogenesis. C, cytoplasm; G, Golgi apparatus; N, nucleus; ne, nuclear envelope; vER, endoplasmic reticulum vesicles; black arrows indicate immunolabelling of Golgi apparatus; grey arrows, only a few immunosignals in cytoplasm, and white arrows, sparse gold grains between fibrils of chromatin within a crescent nucleus. Bar = 100 nm (a) and bar = 250 nm (b)
