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. 2018 Sep 19;9:1352. doi: 10.3389/fpls.2018.01352

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Copyright © 2018 Arnault, Vialette, Andres-Robin, Fogliani, Gâteblé and Scutt.

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) and the copyright owner(s) 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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Summary of expression patterns of ovule integument regulators in Arabidopsis thaliana and Amborella trichopoda. Abaxial-promoting genes are shown in red in enlarged diagrams, adaxial-promoting genes are shown in blue. Mature ovules are shown, though the genes indicated may be maximally expressed in the tissues shown at earlier stages. Entire ovules (on the left) are shown in their natural orientations relative to the longitudinal axis of the gynoecium/carpel. c, chalaza; f, funiculus; ii, inner integument; and oi = outer integument.