A glycine residue ecists at position 210 of the tryptophan, Ask an Expert

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A glycine residue ecists at position 210 of the tryptophan synthetase enzyme of wild-type E.coli. If the codon specifying glycine is GGA, how many single-base substitutions will result in an amino acid at position 210, and what are they? How many will result if the wild-type codon is GGU?

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