>2f73B (B:) observed residues (from ATOM records) gtenlyfqsmsfsgkyqlqsqenfeafmkaiglpeeliqkgkdikgvseivqngkhfkft itagskviqneftvgeeceletmtgekvktvvqlegdnklvttfkniksvtelngdiitn tmtlgdivfkriskri