Variable sites in exons 3, 4, and 5 and intron 4 of the P562 allele and the two P535 alleles (P535 and P535c) of the capuchin. The numbers at the top refer to the positions of the sites on the complete coding sequence (for exons 3, 4, and 5) and to the positions on an alignment of intron 4 sequences (available on request). The five positions in boldface are the five critical amino acid residues, respectively, at positions 180, 229, 233, 277, and 285.