Fig. (9) Electron microscopic radioautogram of the adrenal medullary tissues of a young adult mouse at postnatal month 1, labeled with 3H-thymidine, showing DNA synthesis (several silver grains) in the nuclei as well as in a few mitochondria of 3 adrenalin cells at bottom right, left upper and left bottom corners and 2 noradenalin cells at center. x 3,000. (From Nagata [49]. Courtesy of J Cell Tiss Res 9: 1793-1802, 2009).