Fig. (8) High power electron microscopic radioautogram of the adrenal medullary tissues of a juvenile mouse at postnatal day 14, labeled with 3H-thymidine, showing DNA synthesis (several silver grains) in the nuclei as well as in a few mitochondria of 4 adrenalin cells at center and 2 noradenalin cells at right. x 3,000. (From Nagata [49]. Courtesy of J Cell Tiss Res 9: 1793-1802, 2009).