Fig. 6. Meiotic time-course experiment in the rec10 mutant. (A) Empty meiotic nucleus. The chromatin region is faintly stained by silver nitrate; `n' indicates the more densely stained nucleolus. The arrow points to the spindle pole body which consists of a large and two small bodies. (B) A comparison of the timing of cytological events in the rec10 mutant ED3 and the control JB6 strain. Meiotic nuclei were identified in the electron microscope after spreading and silver staining. The horse-tail stage and the progression of meiotic divisions were analyzed in DAPI-stained cells.