Fig. 3

Optimal promoters of KRT1, KRT2, KRT38 and KRT84 were detected using PGL3-basic system. Promoters of KRTs with different length were constructed into PGL3-basic system. The length of promoters were shown after hyphen character. The corresponding KRT promoter-pGL3 basic vector together with the reference vector pRL-TK were co-transfected into 24-well dermal papilla cells, while the empty vector of PGL3 basic was used as a negative control. All the groups were performed in triplicate