>4xkfB (B:) observed residues (from ATOM records)
gifgaiagfieggwtgmidgwygyhhensqgsgyaadrestqkaidgitnkvnsiinkmn
tqfeavdhefsnlerrignlnkrmedgfldvwtynaellvllenertldlhdanvknlye
kvksqlrdnandlgngcfefwhkcdnecmesvkngtydypkyqkesklnrqgi