Fig. 10. Electron micrographs showing (A) mature PSVs in the prespore cells of a normal slug formed without EtBr-treatment, and (B) marked mitochondrial transformation and a scarce number of PSVs in the posterior region of a slug (
slug) formed from 
cells. Markedly transformed mitochondria (tMt) as observed in 
cells are still retained in 
slugs (B). Mt, mitochondria; PSV, prespore-specific vacuole. Bars, 1 µm.