FISH-labeled human pachytene spermatocytes (3:1 preparation). Chromosomes were cohybridized with WCPs and locus-specific probes. For details of the probes and labeling scheme, see table 1. A and B, WCP11 is shown in green, with the 11q23 locus-specific probe shown in red; WCP22 is shown in red, with the 22q11 probe shown in green (table 1 [experiment 6]). C and D, WCP6 is shown in green, with the 6q26 probe shown in red; WCP22 is shown in red, with the 22q11 probe shown in green (table 1 [experiment 7]). E and F, WCP11 is shown in green, with the 11q23 probe shown in red; WCP22 is shown in red, with the 22q11 probe shown in green; WCP21 is shown in green, with the 21q11 probe shown in red (table 1 [experiment 8]).