Alignment of NAG-1 amino acid sequence from the dog, human, mouse, rat, and chimpanzee (GenBank: human, AAH08962; mouse, NP_035949; rat, CAA09891; chimpanzee, XP_524157). (a) Amino acid sequence alignment of the C-terminal region begins with the first conserved cysteine residue. Conserved cysteine residues are marked with an asterisk (*). Bold letter indicates RXXR motifs. (b) Phylogenetic tree based on NAG-1 amino acid sequence homology among the dog, human, mouse, rat, and chimpanzee.