Assertion: melatonin's receptor | /r/AtLocation | tissue
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text: Nuclear melatonin receptors, which are members of the RAR-related RZR/ROR orphan nuclear receptor superfamily, have been reported to exist in some tissues, and a melatonin-binding site on the enzyme quinine reductase 2 has been identified and is referred to as the mammalian MT3 melatonin receptor.