The GNC family regulates stomatal development in cotyledons. A, Effect on stomata index (SI), meristemoid index (MI), and stomata lineage index (SLI) in cotyledons of Col-0, gnc cga1, and two independent 35S:GNC lines. Parameters were determined for 3-d-old (top), 6-d-old (middle), and 10-d-old seedlings (bottom). For statistical analysis, one-way ANOVA with post-hoc Holm multiple-comparison calculation was used to compare the mutant lines to the wild type (*P < 0.05, **P < 0.01, n = 10). Error bars indicate ± sd. B, GNC ChiP-seq binding profiles based on IGB viewer. Fold enrichment for each sample (IP/input) was computed by MACS using bdgcmp. The range starts at 1 (IP = input), and the maximum varies per panel (4 for ERL1 and ERL2; 3 for EPF2 and EPFL6; 2.5 for SPCH). C, GNC regulates expression of genes involved in stomatal development and patterning. Gene expression determined by RT-qPCR on two independent DEX-inducible GNC lines, as well as wild-type, gnc cga1, and two independent 35S:GNC lines. Statistical analysis was performed as in Figure 6.