>1q52B (B:) observed residues (from ATOM records)
npfdakawrlvdgfddltdityhrhvddatvrvafnrpevrnafrphtvdelyrvldhar
mspdvgvvlltgngpspkdggwafcsggdtvdvaragrlhilevqrlirfmpkvviclvn
gwaaggghslhvvcdltlasreyarfkqtdadvgsfdggygsaylarqvgqkfareiffl
grtytaeqmhqmgavnavaehaeletvglqwaaeinakspqaqrmlkfafnllddglvgq
qlfageatrlaymtdeavegrdaflqkrppdwspfpryf