>2b53A (A:) observed residues (from ATOM records)
menfqkvekigegtygvvykarnkltgevvalkkirtegvpstaireisllkelnhpniv
klldvihtenklylvfeflhqdlkkfmdasaltgiplpliksylfqllqglafchshrvl
hrdlkpqnllintegaikladfglarafgvpvrtythevvtlwyrapeillgckyystav
diwslgcifaemvtrralfpgdseidqlfrifrtlgtpdevvwpgvtsmpdykpsfpkwa
rqdfskvvppldedgrsllsqmlhydpnkrisakaalahpffqdvtkpvphlrl