Transmission electron micrograph of a rat diaphram capillary 24 hrs post intravenous administration of ferritin. Some ferritin is seen in the intracellular vesicles and extracellular spaces. Image m...

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...

Transmission electron micrograph of mouse capillary intestine fenestrated endothelium with hemoglobin in the lumen lumen. The capillary lumen filled with hemoglobin shows continuities across endothe...

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...

Human primary keratinocyte spreading on an asymmetric "arc"-shaped collagen I micropattern. The cells are stained for the focal adhesion protein vinculin (green, Alexa488), F-Actin (red, TRITC phallo...

Figures 358 (upper) and 359 (lower) from Chapter 15 (Cytoplasmic Inclusions) of 'The Cell, 2nd Ed.' by Don W. Fawcett M.D. In some species, Sertoli cells, lipid droplets are abundant. Upper panel: mu...

Figure 367 from Chapter 15 (Cytoplasmic Inclusions) of 'The Cell, 2nd Ed.' by Don W. Fawcett M.D. Filament-like crystalloid of Charcot-Bottcher in a human Sertoli cell. Image from Nagano, T., Z. Zel...

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...

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...