>6cbtB (B:) observed residues (from ATOM records)
qlkrttmriligllvqnpelatlvpplenldenklpglglfrelvntclsqpglttgqll
ehyrgtnnaatleklsmwddiadkniaeqtftdslnhmfdsllelrqeeliarerthgls
neerlelwtlnqelakddipf