Figure 3.

Rama-Z values versus percentage of residues in favored region of Ramachandran plot for all X-ray and cryo-EM derived models in PDB at resolution 5Å or better containing more than 100 amino acid residues. Blue dots represent models with resolution better than 1.2 Å, black dots represent models with resolution between 1.2–5 Å, red crosses represent models shown on Figure 4. The background color represents proposed Rama-Z ranges. Red (below −3 and above 3) is for geometrically improbable backbone geometry, yellow (from - 3 to −2 and from 2 to 3) for unlikely yet possible, green (from −2 to 2) is for normal backbone geometry.