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High-scoring sequence matches to the 4.5-Å ligand-binding residue set of E. coli ribose-binding protein. Residues that cannot duplicate the chemical interaction of RBSB_ECOLI with ribose at a particular alignment position are circled. Sequences with circled residues are not considered to have binding-site matches. Two lower-scoring sequences that qualify as binding-site matches are DEGA_BACSU and 2612909 (below the dotted line).
