>4nrlB (B:) observed residues (from ATOM records)
gffgaiagfleggwegmiagwhgytshgahgvavaadlkstqeainkitknlnslselev
knlqrlsgamnelhdeileldekvddlradtissqielavllsnegiinsedehllaler
klkkmlgpsaveigngcfetkhkcnqtcldriaagtfnagdfslptfdsl