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Root-waving phenotypes of root expansion mutants. A, cob-1; B, cob-2; C, eto1-1; D, eto2-1; E, erh2-1; and F, erh3-1. The ecotype background of all of these mutants is Col. Mutant seedlings were plated left of the dotted line, while wild-type Col seedlings were plated on the right. Seedlings were grown for 8 to 9 d on 1.5% (w/v) agar-solidified medium, tilted backward 30° from the vertical. Images were taken from the bottom of the plates through the medium.
