>5x4lB (B:) observed residues (from ATOM records)
nrlivdeainednsvvslsqpkmdelqlfrgdtvllkgkkrreavcivlsddtcsdekir
mnrvvrnnlrvrlgdvisiqpcpdvkygkrihvlpiddtvegitgnlfevylkpyfleay
rpirkgdiflvrggmravefkvvetdpspycivapdtvihcegepikr