a, Rosettes of Arabidopsis plants with mutant combinations of different TTG1 WDR genes. Plants were germinated at the same time and grown in the same LD conditions. In the triple mutant lwd1lwd2ttg1 leaf morphology is perturbed, whereas single and double mutant combinations have wild type leaf morphologies. These lines were grown repeatedly with no variations on these observations. b, Leaf margins of ttg1 mutant, lwd1ttg1 double mutant and the triple mutant lwd11lwd2ttg1. These differences were observed in a minimum of 6 plants in each of at least three independent batches. c, Boxplot of trichome numbers on the leaf edge of the ttg1 mutant, double mutants and the triple mutant. Data represent total trichome number on a plant with 9 leaves (number of plants counted lwd1lwd2ttg1 17, ttg1 18, ttg1lwd1 13, ttg1lwd2 11). d, Table illustrating p values for pairwise leaf trichome number comparisons. p values were calculated using a non parametric anova using the Kruskal-Wallis test, followed by a post hoc analysis of the means using the Conover test (the null hypothesis that the population medians of all of the groups are equal). Additional details about the statistics can be found in Supplementary Table 3.