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Possible carriers involved in the uptake of xenobiotics by the phloem tissue (apoplastic loading); 1, from Denis and Delrot, 1993; 2, from Leconte, 1989; 3, from Hart et al., 1992; and 4, this work (hypotheses). Carrier-mediated uptake of glyphosate, paraquat, and 2,4D-Lys is complemented by a diffusive component.
