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. 2017 Aug 10;8:1344. doi: 10.3389/fpls.2017.01344

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Copyright © 2017 Podgórska, Burian, Gieczewska, Ostaszewska-Bugajska, Zebrowski, Solecka and Szal.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Enzymes engaged in cell wall metabolism of plants growing on NH₄⁺ and NO₃^– (control). The activity of (A) pectin methylesterases, (B) polygalacturonases, (C) cell wall peroxidases, and (D) phenylalanine ammonia lyases, in leaf tissues, and (E) the protein level of xyloglucan endotransglycosylases; arrow indicates the band representing 33 kDa specific for XTH/XET. Signal intensities of bands were estimated using Image-Lab 5.2 software. Representative results from four independent biological replicates are shown.