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. 2020 Feb 2;9(2):345. doi: 10.3390/cells9020345

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Hypothetical working model of Np_nN’ and NH₂-pA signaling network in a plant cell. Dinucleoside polyphosphate (Np_nN) and adenosine 5′-phosphoramidate (NH₂-pA) trigger induction of the phenylpropanoid and the isochorismic acid pathways yielding metabolites protecting plant against various types of stresses. Plant cells respond to environmental stimuli by intensification of the production of various compounds, such as anthocyanins, lignin, stilbenes, and salicylic acid. Question marks indicate the hypothetical components of the signaling network.