>4ucxB (B:) observed residues (from ATOM records)
akhrpsvvwlhnaecggcteaairtikpyidalildtisldyqetimaaageaaeaalhq
alegkdgyylvvegglptidggqwgmvaghpmiettkkaaakakgiicigtcsayggvqk
akpnpsqakgvsealgvktinipgcppnpinfvgavvhvltkgipdldengrpklfygel
vhdncprlphfeasefapsfdseeakkgfclyelgckgpvtynncpkvlfnqvnwpvqag
hpclgcsepdfwdtmtpfyeqg