Figure 2. (A) Human PrP 90–230 structure from Zahn et al., 2000.⁶¹ PDB entry 1QM1. The sequence 127–131 is highlighted where residue 129 is colored red. (B) Chicken PrP 119–230 structure from Calzolai et al., 2005.⁶² PDB entry 1U3M. The sequence 127–131 is highlighted where residue 129 is colored red and residue 130 is colored in magenta. Sequence numbering according to human sequence.