Epidermal CFR phenotypes of root expansion mutants. Seedlings were grown on an agar surface tilted backward by 30° and photographed 9 DAG. All root images were taken at the tip. A, Wild-type Col; B, rhd1-1; C, cob-1; D, cob-2; E, eto1-1; F, eto2-1; G, erh2-1; and H, erh3-1. Scale bars =100 μm.