Fig. 2: The quality of the electron density maps for PrP in the V127/M129 PrP - ICSM-18 Fab complex at 2.3 Å resolution.
From: Structural effects of the highly protective V127 polymorphism on human prion protein

Residues from the PrP β-sheet and the V127 polymorphism are shown; 2FO –FC map contoured at 1σ.