sentence: Additionally , motifs 6 and 5 were also detected in a great many proteins in subfamilies IIIf and III ( d + e ) , such as TabHLH239 , AtMYC2 , TabHLH184 and ZmbHLH103 , and we found they were significantly matched with an ACT domain that contributed to the recruitment of the C1 R2R3-MYB factor to the C1 binding sites located in the promoters of flavonoid biosynthetic genes [ 40 ] .