Fig. 2.

Secondary structural alignment for the molecular structures of the presumed Crotalus s. scutulatus metalloproteinases, atrolysins (Ht-a, Ht-c, Ht-d, and Ht-e,) and the crystal structures of atrolysin Ht-d and adamalysin II (1IAG). Gaps are introduced for a better alignment. Consensus amino acid residues (*) and chemically similar (.) amino acid residues are indicated. Residues that participate in the α-helix (h) and β-sheet (s) formation are indicated below the amino acid residues