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GTP cyclohydrolase II Several members of the family are bifunctional, involving both ribA and ribB function. In these cases, ribA tends to be on the C-terminal end of the protein and ribB tends to be on the N-terminal. The function of archaeal members of the family has not been demonstrated and is assigned tentatively. [Biosynthesis of cofactors, prosthetic groups, and carriers, Riboflavin, FMN, and FAD]
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