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 with bivalents at the spindle equator, followed by anaphase onset, chromosome segregation and the start of cytokinesis. T...

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...

Time series of anaphase A and B of meiosis I in primary spermatocytes of the crane-fly Nephrotoma suturalis. Time-lapse polarization microscopy using a Nikon Microphot SA, equipped for liquid crysta...

Transmission electron micrographs. The upper panel shows a section through a frog nucleated erythrocyte. The nucleus is largely filled with heterochromatin which appears to have a fibro-granular stru...

Figure 337 from Chapter 14 (Sperm Flagellum) of 'The Cell, 2nd Ed.' by Don W. Fawcett M.D. A transverse section through a portion of a sperm bundle of the newt, Notophthalmos viridescens at the level...

Figure 340 from Chapter 14 (Sperm Flagellum) of 'The Cell, 2nd Ed.' by Don W. Fawcett M.D. Cross sections of sperm tails of a caddis fly illustrate differences between the organization of the insect ...

Figures 331 (left) and 332 (right) from Chapter 14 (Sperm Flagellum) of 'The Cell, 2nd Ed.' by Don W. Fawcett M.D. Left, longitudinal section of midpiece from sperm of the suni antelope; right, longi...

Figure 421 from Chapter 16 (Cytoplasmic matrix and cytoskeleton) of 'The Cell, 2nd Ed.' by Don W. Fawcett M.D. Horizontal section through the apical cytoplasm of a Sertoli cell in the testis of the t...

Echinoderm sperm nuclei are unusual in that chromatin fibers are clearly seen, allowing their diameter to be accurately determined. Here, sperm from the starfish P. miniata were treated to remove the ...