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Effect of exogenous SkXTH1 (300 ng mL−1) on the extension of heat-inactivated (boiling in water for 15 s) longitudinal and transverse onion epidermal strips at pH 4·5. The enzyme stimulated extension transverse to the net cellulose orientation (P < 0·01, paired two-tailed t-test) but not parallel to it. Data are mean ± s.e., n = 9.
