Ultrastructure of paracriny/steroidogenesis in principal cells of the marmoset epididymis.

The ultrastructural features of the principal cell in the epididymal epithelium of the marmosets are distinguished by an intercellular exchange of substances contained within cytoplasmic vesicles and the presence of paracrystalline bodies. The possibility of the exchange of substances constituting paracriny and the paracrystalline inclusion having a role in steroidogenic activity is discussed.