FISH with breakpoint-spanning human PAC clones RP5-1029K10 (A and B) and RP1-179H24 (E and F) and chimpanzee BACs RP43-134L13 (C and D) and RP43-141Q35 (G and H). A, C, E, and G, Results of hybridizations on chromosome preparations of chimpanzee lymphoblastoid cell lines. B, D, F, and H, Results of FISH on human lymphocyte metaphases.