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SDS-PAGE analysis of selected fractions extracted from root cap cell walls, which include border and border-like cells. The β-GlcY precipitate (15 µg) and extracted pectin (15 µg) were run on gels, blotted, and probed with antisera recognizing arabinogalactan proteins (JIM8 and JIM13) and pectin (JIM5). Molecular mass is indicated in kD on the left. Bn and Ps indicate material from B. napus and pea, respectively. Cit, Commercial citrus pectin; gA, gum arabic.
