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. 2017 Dec 12;8:176. doi: 10.3389/fgene.2017.00176

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Copyright © 2017 Gu, Meng, Chen, Wei, Dong, Lu, Wang, Chen, Zhao and Shen.

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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Two types of head leaf patterns in top region during the formation of heads (red arrows) for self-crossed progenies from line B3-29. Overlapping type: (A) seedling stage; (B) rosette stage; (C) heading stage. Outward-curling type: (D) seedling stage; (E) rosette stage; (F) heading stage. Leaf veins: (G) overlapping type; (H) outward-curling type. Appearance after head-forming leaves were removed in individual layers (left to right, outer to innermost layer): (I,J), overlapping type; (K,L), outward-curling type.