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. 2016 May 31;6:26906. doi: 10.1038/srep26906

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(a) Tautomers of apocynin (1). (b) Possible Michael addition between Cys68 thiolate and apocynin quinonemethide tautomer (2) within NAT active site. Cys68, His107 and Asp122 constitute the catalytic triad in mammalian NAT enzymes⁴⁶,⁴⁷. (c) Possible interaction between exposed thiols groups of NATs and radical apocynin metabolites (3).