a) Structural representation of the A111V mutation. The wild-type chain A is shown in green color, mutant chain A in cyan, wild-type chain B in yellow, and mutant chain B in orange. The amino acid residue Ala 110 (wild-type) is shown in magenta, and Val 110 (mutant) in white.
b) Structural representation of T119N. Chains A and B are shown in green and yellow, respectively. The residue Asn 119 (wild-type) is shown in pink, and Thr 119 (mutant) in blue.
c) Multiple sequence alignment of HBA2 with the amino acid substitution sites indicated.