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Flavonols are a large class of flavonoids,which confer benefits to plant,animal and human health.Flavonols,in forms of flavonol glucosides,are the predominant flavonoid groups present abundantly in model legume Lotus japonicas.However,UDPglucosyltransferase that is reponsible for the biosynthesis of flavonol glycoside remains uncharacterized in L.japonicas.