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Fig. 6. FESEM micrographs of the innermost cell wall layer of wild type, rsw4 and rsw7 plants in the elongation zone (wild type) or swollen region of the root. (A-C) Longitudinal-radial cell walls with the long axis of root parallel to the long axis of the page. (A) Wild type, (B) rsw4 and (C) rsw7, grown at 19°C for 6 days and transferred to 30°C for 2 days. (A-B) PEG sections, (C) cryo-ultramicrome. Bar: 100 nm.