>4bckA (A:) observed residues (from ATOM records)
gsmenfqkvekigegtygvvykarnkltgevvalkkirldtetegvpstaireisllkel
nhpnivklldvihtenklylvfeflhqdlkkfmdasaltgiplpliksylfqllqglafc
hshrvlhrdlkpqnllintegaikladfglarafgvpvrtythevvtlwyrapeillgck
yystavdiwslgcifaemvtrralfpgdseidqlfrifrtlgtpdevvwpgvtsmpdykp
sfpkwarqdfskvvppldedgrsllsqmlhydpnkrisakaalahpffqdvtkpvphlr