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Retinoids override that regulatory mechanism

During the process of melanogenesis, hydroxylation of L-tyrosine to form L-3,4-dihydroxyphenylalanine (L-DOPA) is the rate-limiting step of the whole process, which is catalyzed by TYR

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Apart from these modes of action, riboflavin has also been shown to activate specific neuroactive molecules such as vitamin B 6 (which confers neuroprotection based on a role in serotonin production) 73 , homocysteine (which has a double-edged neurological role) 74 and kynurenine involved in glutamate excitotoxicity (i.e., excess of glutamate in neural synapse, resulting in death of neural cells) 75