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Structure and sequence comparisons. (a) Overlaid NMR structures of human, bovine and porcine PrP (blue: HuPrP PDB code 1QM2; green: BoPrP PDB code 1DWY; pink: PoPrP PDB code 1XYQ). (b) Sequence alignment with residues unique for one of the 3 species indicated with color code as in a)
