Fig. (7) Low 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 10 adrenalin cells at upper left and 15 noradenalin cells at center and right. x 1,000. (From Nagata [49]. Courtesy of J Cell Tiss Res 9: 1793-1802, 2009).