Fig. 4. ett has an adaxialized phenotype. (A) The morphology of 3-week-old wild-type, ett-7 and kan-12 plants. kan-12 has flat leaves, whereas ett-7 is not dramatically different from wild type. (B) Camera lucida drawings of adaxial and abaxial mesophyll cells of leaf 6 of wild-type and mutant plants. The adaxialized phenotype of kan1-12 is shown for comparison. The phenotype of ett-7 is slightly weaker than that of kan1-12. ett-15 and arf4-2 have a much less significant effect, if any, on the shape of abaxial mesophyll cells.