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Colocalization of protamine-type proteins (20 nm gold, black arrowheads) and CRT (10 nm gold, white arrowheads) at V stage of C. vulgaris spermiogenesis. a-b Arrows show common localization immunosignals for protamine-type proteins and calreticulin in particular spermatid compartment. cER, endoplasmic reticulum cisternae; vER, endoplasmic reticulum vesicles; G, Golgi apparatus; N, nucleus; ne, nuclear envelope; Bars═100 nm
