When a mutation substitutes for a single codon, which position is most likely to change the amino acid associated with that codon? Why is that?

Answers to the concentration of medication question

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This gentleman has worsening bilateral hydronephrosis. he did not have much of a post void residual on his bladder scan. he is taken to the operating room to have a bilateral cystoscopy and retrograde pyelogram. cpt code: icd10-cm code: icd10-cm code: icd10-cm code