Definition of "hydroxylase" []

• Any of several enzymes that catalyze the oxidation of compounds by the introduction of hydroxyl groups (noun)

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• "Kinney's team found that serotonin levels were 26 percent lower in tissue from babies who died of SIDS than those who died from other causes, and they also found low levels of the enzyme tryptophan hydroxylase, which is needed to make serotonin."
• "The study also found that infants with insufficient serotonin also had low levels of the enzyme tryptophan hydroxylase, which is needed to make serotonin."
• "The parasite infects the brain by forming a cyst within its cells and produces an enzyme called tyrosine hydroxylase, which is needed to make dopamine."