>1k73Q (Q:) observed residues (from ATOM records)
tdlsaqkrlaadvldvgknrvwfnperqgdiadaitredvrelvdegaiqakdkkgnsrg
rarerqkkrakghqkgagsrkgkagarqnskedwesriraqrtklrelrdegtlsssqyr
dlydkagggefdsvadleryida