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Amino acid comparison of human, gorilla, macaque, american elk, cattle and sheep PrPC amino acid sequences. Only amino acids 88 to 233 (according to human PrP) are included in the comparison for clarity. Deletions are indicated by dashes. Points indicate identical residues. Amino acid numbering is indicated on the right. Species are named on the left. Amino acid changes in 166 and 168 positions (Met/Val and Glu/Gln respectively) are boxed
