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Multiple sequence alignment of the deduced amino acid sequence of APB-AN with other identified aminopeptidase Bs. RAT APMP (from rat liver); HUMAN AMPB (from human lymphocyte); GOAT AMPB (from goat brain). Amino acids are numbered with respect to the first amino acid of the sequence. Gaps are introduced to optimize the alignment. “Red box”: HEXXHX18E motif. “*”: conservative amino acids; “:”: conservative substitution; “.”: semi-conservative substitution
