Fig. 2. Fluorescence in situ hybridization of centromere probes to chromosomes in syn1 meiocytes. Hybridization of a centromere probe (pAL1) was detected with fluorescein-labeled streptavidin (green). Chromosomes were stained with PI (red). (A) An example of an early leptotene meiocyte showing six centromere signals; (B) zygotene; (C) diplotene; (D) diakinesis; (E) metaphase; (F) telophase I. Assignment of the stage of the cell cycle is approximate and based both on chromosome morphology and the stage of surrounding cells in the anther. Bar, 5 µm.