>4ym2D (D:) observed residues (from ATOM records)
gpptfnppvpyfgrlqggltarrtiiikgyvpptgksfainfkvgssgdialhinprmgn
gtvvrnsllngswgseekkithnpfgpgqffdlsircgldrfkvyangqhlfdfahrlsa
fqrvdtleiqgdvtlsyvqi