>1b55B (B:) observed residues (from ATOM records)
aavilesiflkrsqqkkktsplnfkkrlflltvhklsyyeydfergrrgskkgsidveki
tcvetvvpeknppperqisemeqisiierfpypfqvvydegplyvfspteelrkrwihql
knvirynsdlvqkyhpcfwidgqylccsqtaknamgcqilen