>1xfsB (B:) observed residues (from ATOM records)
tpidaeldlmlkrelavpvnlvwrgltepellkkwfvpkpwsisdcrvdlrpggefytvm
qdpegnkfpnsgcflevtdekrliwtsalvknyrpavpivmtavielqptssgtrytaca
mhntpgqrklheemgfhgwgttitqleellkqek