Fig. 2.

Phenylalanine mutation process. Stick representation of phenylalanine 483 and its change to alanine. Carbon atoms represented in dark gray, hydrogens in light gray, oxygen in red, nitrogen in blue, and dummy atoms in white. The side chain torsion, χ ₁, is depicted in orange. CB was changed from a CH₂ group in F483 into a CH₃ in A483