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HAT activity in the cleft palate on GD 13.5, GD 14.5 and GD v15.5 in the control and TCDD groups. Data are presented as the mean ± standard deviation. *P<0.01 vs. the control group. HAT, histone acetyltransferase; GD, gestation day; TCDD, 2,3,7,8-tetrachlorodibenzo-p-dioxin.
