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![[Figure 8]](kw5028fig8mag.jpg)
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Figure 8
Ramachandran plots of the helical area for (a) residues five positions away from both ends of helices that are nine residues long or longer and (b) residues at one of the first three positions of an α-helix. The contour lines are for the 18 normal residues in a helix (purple) and in a loop (green), contouring at 50–90% of what is observed in the WHAT IF database of 500 sequence-unique high-quality X-ray structures solved at 1.4 Å resolution or better (Hooft et al., 1997  ). |
![[Figure 8]](kw5028fig8.jpg)
 | STRUCTURAL BIOLOGY |
ISSN: 2059-7983
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