Human duodenal epithelium, at the level of the crypt. Fixation was carried out inbuffered formal-calcium. Peroxisomes are stained with DAB by their catalase activity at pH 10.5, postosmicated and embe...

Figures 417 (upper) and 418 (lower) from Chapter 16 (Cytoplasmic matrix and cytoskeleton) of 'The Cell, 2nd Ed.' by Don W. Fawcett M.D. A marginal bundle of microtubules is associated with the ellipti...

Figure 375 from Chapter 15 (Cytoplasmic Inclusions) of 'The Cell, 2nd Ed.' by Don W. Fawcett M.D. Freeze-fracture replica of a cell from rat adrenal medulla. Using this technique, secretory vesicles...

Light micrograph of human ovum (egg) and sperm. The ovum is much larger than the sperm and is surrounded by protective cumulus cells around the outside surface (yellow). The membrane surrounding the o...

This fluorescent micrograph shows stem cells labeled with green fluorescent protein (GFP) located at the base of the colonic crypt in a section of mouse colon. The stem cells are surrounded by numerou...

Figure 169 from Chapter 5 (Endoplasmic Reticulum) of 'The Cell, 2nd Ed.' by Don W. Fawcett M.D. Electron micrograph of rough endoplasmic reticulum (RER) in an acinar cell from the pancreas of the sma...

Figure 187 from Chapter 5 (Endoplasmic Reticulum) of 'The Cell, 2nd Ed.' by Don W. Fawcett M.D. An abundance of smooth endoplasmic reticulum is apparent in this Leydig cell of the opossum testes, ass...

Figures 284 (upper) and 285 (lower) from Chapter 9 (Peroxisomes) of 'The Cell, 2nd Ed.' by Don W. Fawcett M.D. Diaminobenzidene reacts with peroxidase to produce a dense reaction product in the perox...

Figure 391 from Chapter 15 (Cytoplasmic Inclusions) of 'The Cell, 2nd Ed.' by Don W. Fawcett M.D. Secretory granules of a mast cell from rat connective tissue. Secretory granules in this cell type ar...

Early transmission electron micrograph of thin section of acinar cell on guinea pig pancreas. Rough endoplasmic reticulum, Golgi vesicles and portion of a zymogen granule are seen. Image made availab...