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. 2019 Mar 29;12:19. doi: 10.1186/s12284-019-0279-9

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 1 — The molecular structure of common active cytokinins. a The molecular structure of Isoprenoid CKs. There are four forms of Isoprenoid CKs, N⁶-(∆²-isopentenyl) adenine (iP), trans-zeatin (tZ), cis-zeatin (cZ), dihydrozeatin (DZ). b The molecular structure of Aromatic CKs. There are five forms of Aromatic CKs, ortho-topolin(oT),meta-topolin(mT),benzyladenine(BA),ortho-methoxytopolin(MeoT), meta-methoxytopolin(MemT)