The image shows a developing Drosophila spermatid immunostained for caspase activity (green). TRITC-phalloidin is used to label actin (red). Caspase is required in spermiogenesis for the elimination ...

Time series of meiosis I, starting at metaphase, in primary spermatocytes of the crane-fly Nephrotoma suturalis that have been experimentally flattened. Time-lapse polarization microscopy using a Nik...

Figure 328 from Chapter 14 (Sperm Flagellum) of 'The Cell, 2nd Ed.' by Don W. Fawcett M.D. Scanning electron micrograph of rabbit spermatozoa on the endometrium of the uterus. Image by David Phillip...

Figures 206 (upper) and 207 (lower) from Chapter 6 (Golgi Apparatus) of 'The Cell, 2nd Ed.' by Don W. Fawcett M.D. During development of the acrosome in the chinchilla spermatid, the transitional zon...

Figures 424 (upper) and 425 (lower) from Chapter 16 (Cytoplasmic matrix and cytoskeleton) of 'The Cell, 2nd Ed.' by Don W. Fawcett M.D. The nucleus and adjacent the manchette rodent spermatids. The ...

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...

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...

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...

In insect spermiogenesis, mitochondrial cristae disappear and a proteinaceous material is deposited in filaments that become closely packed paracrystalline arrays. In this micrograph, crystals are pr...