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. 2013 Oct 10;14:691. doi: 10.1186/1471-2164-14-691

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Copyright © 2013 Huang et al.; licensee BioMed Central Ltd.

This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Timing expression of flowering or floral genes in hickory compared with that in A. thaliana. Flowering and floral developmental phase in hickory versus A. thaliana depending on morphological ontogeny. Phase 1: Stage 1–5 of the dataset from hickory and Stage 1–2 of the dataset from A. thaliana in which there is no morphological change. Phase 2: Stage 6 for hickory and Stage 3–4 for A. thaliana during which flower primordia of hickory and sepal primordia of A. thaliana are initiated. Phase 3: Stage 7 for hickory and Stage 5–6 for A. thaliana, in which pistillate flowers of hickory are developed and stamen of A. thaliana is initiated. Phase 4: Stage 8 for hickory and Stage 7 for A. thaliana, in which carpel development is initiated in both plants.