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Isoquinoline alkaloids (IQAs), terpenoid indole alkaloid and nicotine are some of the most studied alkaloids. Recently, several groups have reported that the biosynthesis of these alkaloids is regulated by basic helix-loop-helix (bHLH) transcription factors. Whereas the biosyntheses of nicotine and
(S)-Norcoclaurine synthase (NCS) (EC 4.2.1.78) catalyzes the condensation of 3,4-dihydroxyphenylethylamine (dopamine) and 4-hydroxyphenylacetaldehyde (4-HPAA) as the first committed step in the biosynthesis of benzylisoquinoline alkaloids such as morphine, sanguinarine, and berberine, in plants. A