>1rtrB (B:) observed residues (from ATOM records)
tnlpmnklidevnnelsvainksvmdtqleesmlyslnaggkrirpvlllltldslntey
elgmksaialemihtyslihddlpamdnddyrrgkltnhkvygewtailagdalltkafe
lissddrltdevkikvlqrlsiasghvgmvggqmldmqsegqpidletlemihktktgal
ltfavmsaadianvddttkehlesysyhlgmmfqikddlldcstyvsllgkdgaedklty
hrdaavdeltqideqfntkhlleivdlfysr