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Distinct trichome formation in the leaf margin and lamina. Influence of phytohormones on trichome development in the glabrous mutants ttg1, gl3egl3, gl1, and gl3egl3tt8, as visualized by light microscopy (A) and scanning electron microscopy (B). Marginal trichomes and laminal trichome primordia are indicated by yellow and white arrowheads, respectively.
