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A member asked:

What is the pathway and role of vitamin b12 in metabolism/catabolism of phenylalanine and tyrosine? thank you.

A doctor has provided 1 answer

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.

Answered 2/3/2014

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