A hypothetical or rare enzyme that catalyzes reduction reactions, combining 'co-' with 'reductase' (an enzyme that removes oxygen or adds hydrogen).
From 'co-' (together/joint) + 'reductase' (from Latin 'reducere' meaning 'to lead back,' + '-ase' enzyme suffix). This appears to be technical scientific nomenclature.
Enzyme names ending in '-ase' are a clever scientific system—'reductase' does reduction, 'oxidase' does oxidation, 'ligase' does joining—so once you know the pattern, you can guess what thousands of enzymes do without looking them up.
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