text: For example, an enzyme that catalyzed this reaction would be an oxidoreductase:
  :A + B → A + B
  In this example, A is the reductant (electron donor) and B is the oxidant (electron acceptor).
  In biochemical reactions, the redox reactions are sometimes more difficult to see, such as this reaction from glycolysis:
  :P + glyceraldehyde-3-phosphate + NAD → NADH + H + 1,3-bisphosphoglycerate
  In this reaction, NAD is the oxidant (electron acceptor), and glyceraldehyde-3-phosphate is the reductant (electron donor).