Pachytene CPA spermatocyte. (A, B) One SC shows terminal asynapsis (arrow), confirmed by BRCA1 staining. Two other elements are stained by BRCA1, indicative of their asynapsed status. (C) Posterior FISH analysis revealed that unsynapsed chromosomes correspond to CPA chromosomes 11 and X. The third unsynapsed element should be the Y chromosome. Bar represents 10μm.