>2r3xB (B:) observed residues (from ATOM records)
kpklhyfnarglmestrwllaaagvefeekfiksaedldklrndgylmfqqvpmveidgm
klvqtrailnyiaskynlygkdikeralidmyiegiadlgemilllpvcppeekdaklal
ikekiknryfpafekvlkshgqdylvgnklsradihlvellyyveeldsslissfpllka
lktrisnlptvkkflqpgsprkppmdeksleearkifrf