Cytoplasmic vesicle, secretory vesicle, acrosome . Cytoplasm, cytoskeleton . Located at the edge of the acrosomal region, neck and annulus during spermiogenesis. Colocalizes with RAB3A at the acrosome-acroplaxome and neck regions of spermatids. Colocalizes with ACTB at the neck region in elongated spermatids. .
Expressed in round and elongated spermatids (at protein level). Expressed specifically in adult testis and very weakly in fetal brain.
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