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Selenosugar synthase SenB is involved in the biosynthesis of the antioxidant selenoneine. (A) Biosynthetic pathway of selenoneine. (B) Overall architecture of SenB. Domains and secondary structure elements are labeled. The C-terminal α-helix that traverses the molecule is colored dark blue. All other β-strands and α-helices/loops are shown in orange and light blue, respectively.
