Fig. (1) Electron microscopic radioautogram of the adrenal
medullary tissues of a mouse embryo at fetal day 19, labeled with
3H-thymidine, showing DNA synthesis (several silver grains) in the
nuclei as well as in a few mitochondria of 4 adenalin cells at right
and 1 noradrenalin cell at left. x 3,000. (From Nagata [49].
Courtesy of J Cell Tiss Res 9: 1793-1802, 2009).