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Fig. 8. (A) Adult sem1 mutant leaf showing yellow, zebra striping. (B,C) Impaired root development in sem1 mutants. (B) Root development in a non-mutant seedling. Arrow, hypocotyl (seedling stem). (C) Root development in a sem1 mutant seedling. (D,E) Transverse sections of the hypocotyl in non-mutant siblings (D) and in smaller mutant plants (E) reveal no gross abnormalities in vascular development in sem1-R mutant seedlings. Scale bar for D and E, 50 µm.