Spermiogenesis and ultrastructure of spermatozoon of Nicolla wisniewskii (Digenea, Opecoelidae), an intestinal parasite of Salmo trutta, were studied by electron microscopy. Spermiogenesis follows the ...

Infertility has become a major medical and social problem worldwide and many of the cases are due to male infertility. Yet the molecular mechanisms involved in spermatogenesis are only now beginning ...

During fertilization, the entire spermatozoon enters the oocyte. However, most of its organelles, including mitochondria, are not transmitted to the offspring. A new study demonstrates for the first ...