Analysis of CCR5, CXCR4, BOB, Bonzo, and CCR3 of resistant macaque 359 and susceptible macaques 570 and 357. The coreceptor coding sequences were amplified by PCR with the primers specified in Materials and Methods. The resultant PCR products were digested with the restriction enzymes PstI (CCR5), BamHI (CXCR4), NdeI (BOB), EcoRV (Bonzo), or KpnI (CCR3); denatured; and analyzed on polyacrylamide gels. The arrow marks the altered banding pattern observed in the CCR5 gene of macaque 359.