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. 2019 Jun 30;20(13):3215. doi: 10.3390/ijms20133215

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© 2019 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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Biosynthesis pathway of polyamines in plants. ADC: arginine decarboxylase; AIH: agmatine iminohydrolase; CPA: N-carbamoylputrescine amidohydrolase; SPDS: spermidine synthase; SPMS: spermine synthase; OTC: ornithine transcarbamoylase; ODC: ornithine decarboxylase; DAO: diamine oxidase; GABA: γ -aminobutyric acid; SAM: S-adenosylmethionine; SAMDC: S-adenosylmethionine decarboxylase; dcSAM: decarboxylated S-adenosylmethionine; ACC synthase: 1-aminocyclopropane-1-carboxylic-acid synthase. Arrows represent the synthesis/conversion.