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MYB4-subgroup is well known a kind of transcription repressor of lignin production and some genes such as C4H, 4CL are its' targets as previously reported, as well as the flavonoids accumulation can be regulated by MYB4-subgroup.In this paper, a new MYB4-subgroup transcription factor (named as CsMYB4a) was cloned from tea plant and overexpressed in tobacco.