Figure 1: TEM showing Balb/C ES cells. (A) n: nucleus, nu: nucleolus, rer: dilated RER, ly: lysosomes, apv: autophagocytic vacuole, (B) mv: microvilli, rb: residual bodies, m: juvenile mitochondria, cp: cell process, (C) m1: poorly developed mitochondria, m2: well-developed mitochondria, ld: lipid droplets, dv: digestive vacuole, (E) m: reticular form of mitochondria, (F) m: large poorly developed mitochondria, stalks of RER (arrows).