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Neighbor-joining phylogenetic tree of 41 calpain sequences, including 268 amino acids. GenBank accession numbers are indicated when no precise identification was published and/or when several sequences were available for one species. Bootstrap values at the nodes are noted (neighbor-joining/parsimony/maximum likelihood, respectively); values under 50% have been discarded and are indicated by dots. The scale bar indicates 3.9715% of amino acid substitutions.
