DON W. FAWCETT / SCIENCE PHOTO LIBRARY DON W. FAWCETT / SCIENCE PHOTO LIBRARY
Transmission electron micrograph (TEM) of a macrophage in the interstitium of the testis in an opossum (Didelphis virginiana). Pinocytosis can been seen as the folds of the macrophage trap droplets of fluid (in light blue).
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