Fig. 5. Chromosome territories of porcine chromosomes 5 (A,A'), 13 (B,B',B''), X and Y (C,C',D,D'). Confocal optical mid-sections of frozen tissue sections of porcine testes are displayed with insets showing different cell types from other sections. Nuclei are counterstained with propidium iodide pseudocoloured in red (A,B) and the autosomes delineated in green. (C,D) Nuclei are counterstained with DAPI (blue), the X chromosome territories are in red and the Y chromosome territories are in green. Primary spermatocytes are identified by broader long arrows, secondary spermatocytes are identified by narrow long arrows and spermatids are identified by short, thick arrows.