Figure 2.

Cotyledon and leaf vein patterns. A, Normal cotyledon vein pattern. mv, Midvein; ds, distal secondary vein; ps, proximal secondary vein; d, distal areole; p, proximal areole. B, Leaf vein pattern of an untreated leaf. C, Leaf vein pattern typical of a seedling treated with polar auxin transport inhibitors. The thick gray line represents a broad band of disorganized TEs. D, Early vein development in a normal leaf. Dashed lines represent provascular tissue and solid lines represent veins containing TEs. E, Early leaf vein development in a seedling grown in the presence of polar auxin transport inhibitors. Dashed and solid lines are as in the untreated leaves. The gray line represents the band of misshapen TEs that accumulate around the leaf margin.