Movie of meiosis I (diakinesis through telophase)in primary spermatocytes of the crane-fly Nephrotoma suturalis that have been experimentally flattened. Time-lapse DIC microscopy using a Nikon Micro...

Movie of meiosis I and II in primary spermatocytes of the crane-fly Nephrotoma suturalis. Time-lapse DIC microscopy using a Nikon Microphot SA, equipped for liquid crystal polarized light microscopy...

Transmission electron micrographs of Opossum spermatogonia showing different regions within the nucleolus. One region is more lightly staining and fine textured, the other denser and more coarsely tex...

The midpiece of spermatzoa in nearly all vertebrates is enclosed in a sheath of mitochondria, which provide a ready source of ATP necessary for sperm motility. Here, a longitudinal section through sp...

The events of meiosis I in a living insect spermatocyte beginning at metaphase with bivalents at the spindle equator, followed by anaphase onset, chromosome segregation and the start of cytokinesis. T...

The events of meiosis II in a living insect spermatocyte beginning at the completion of prophase II through the comletion of cytokinesis. Testes from the Crane fly Nephrotoma suturalis were observed w...

The events of meiosis I in a living insect spermatocyte beginning at metaphase I with bivalents at the spindle equator followed by anaphase, segregation of half-bivalents diakinesis and commencement o...

The events of meiosis I in a living insect spermatocyte beginning at diakinesis through telophase to the near completion of cytokinesis. Testes from the Crane fly Nephrotoma suturalis were observed wi...

The events of meiosis I in a living insect spermatocyte beginning at metaphase with meiotic bivalents at the spindle equator followed by anaphase , segregation of bivalents to the spindle poles and t...

Figure 205 from Chapter 6 (Golgi Apparatus) of 'The Cell, 2nd Ed.' by Don W. Fawcett M.D. Sequence of the development of the acrosomal cap in spermatids from guinea pig testis, as observed in electro...