- humoral r. a substance whose action is a result of contact with targets for activity through blood or body fluids.
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reg·u·la·tor 'reg-yə-.lāt-ər n
1) one that regulates
2) REGULATORY GENE
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reg·u·la·tor (regґu-lə-tər) a mechanism or process that controls another mechanism or process.Medical dictionary. 2011.