>2f73A (A:) observed residues (from ATOM records)
tenlyfqsmsfsgkyqlqsqenfeafmkaiglpeeliqkgkdikgvseivqngkhfkfti
tagskviqneftvgeeceletmtgekvktvvqlegdnklvttfkniksvtelngdiitnt
mtlgdivfkriskri