Determine the codon for each mutant

Mutational changes were induced in a single codon in the gene of T4 phage. The following amino acid substitutions were observed. By following the base changes in the codons, determine the codon for each mutant. Assume each amino acid substitution resulted from a single base substitution. Codons for several amino acids are provided. UAG, UAA, and UGA are stop codons.

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