Sequence alignment of Atr-III with other snake venom metalloproteinases (SVMPs) from different pit viper species. The sequence of Atr-III is aligned corresponding to those of the following venom proteins: Bothropasin from B. jararaca (AAC61986), Batroxrhagin from the Brazilian B. atrox (KR632593), Jararhagin from B. jararaca (P30431), B. insularis P-III from B. insularis (AAM09693), Leuc-B from B. leucurus (P86092) and Atr-I, a P-I SVMP from the same B. atrox venom (P85420). Amino acid numbering follows that of Atr-III. Residues are denoted if highly homologous (*) or strongly similar (:). The zinc binding motif (HEGNHLGIHHD) and the methionine 168 of the Met-turn region are invariant and are highlighted in blue. Putative N-linked glycosylation site is bold and boxed in yellow. The cysteine residues are bold and highlighted. Disintegrin-like (ECD) sequences are highlighted in green. Gaps (-) were introduced to optimize the sequence identity. a.a., amino acids. Sequences were aligned using the CLUSTAL W Program.