Three subfamilies of bHLH genes in Arabidopsis involved in root epidermis development.

*The bHLH gene numbering and subfamily organization (based on structural similarities and bHLH domain sequence) have been previously defined [53].

**Values represent the average fold-change from a multi-way SAM of wer myb23, ttg, and gl3 egl3 versus cpc try. False discovery rate (q-value) is shown in parentheses.