Transmission electron micrograph showing capillary mouse myocardium continuous endothelium using a hemoglobin tracer in caveolae. Hemoglobin, used as a tracer, is seen in the lumen of a capillary lin...

Transmission electron micrograph of mitochondria from a guinea pig uterus. The use of osmium tetroxide as a fixative for electron microscopy was first described by Dr. Palade at the Rockefeller. Anot...