. "\"Catalysis of an oxidation-reduction (redox) reaction in which a CH-CH group acts as a hydrogen or electron donor and reduces a hydrogen or electron acceptor.\" [GOC:ai]" . . "oxidoreductase activity, acting on the CH-CH group of donors" . "EC:1.3" . "Note that enzymes of class EC:1.3.99.- should also be annotated to this term." . . "oxidoreductase activity, acting on the CH-CH group of donors, other acceptors" .