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. 2017 Mar 3;7:56. doi: 10.1038/s41598-017-00156-1

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© The Author(s) 2017

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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Developmental stages of Cunninghamia lanceolate zygotic embryos collected on different dates and from different seed orchards. (a) Green female cones. (b) Immature seeds. (c) Megagametophyte. (d) Embryos at the cleavage polyembryony stage. (e) Embryos at the dominant embryo stage. (f) Embryos at the precotyledon stage. Bars 1 mm.