What is the pathway and role of vitamin B12 in metabolism/catabolism of phenylalanine and tyrosine? Thank you.

Nothing. In the normal child less than 50% of dietary phenylalanine is utilized for polypeptide ; protein synthesis. Most of that remaining is converted to tyrosine. All this takes place by enzymatic chemical activity and I am not aware that vitamin b-12 is involved.

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Is deficiency of vitamin B12 affects metabolism and if yes then how it affects?

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