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Three representative images (B, C, and D) of spermatids from an adult wild-type mouse processed for immunoelectron microscopic detection of RC/BTB2 protein. The particles are concentrated in the acrosomic region (arrows), closely associated with nuclear membrane. The arrow heads in B and C point to developing acrosomes. A is a negative control in which the section was stained with pre-immune serum. N: Nucleus.
