>4ylzB (B:) observed residues (from ATOM records)
ptfnppvpyfgrlqggltarrtiiikgyvpptgksfainfkvgssgdialhinprmgngt
vvrnsllngswgseekkithnpfgpgqffdlsircgldrfkvyangqhlfdfahrlsafq
rvdtleiqgdvtlsyvqi