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. 2020 Apr 23;71(16):4812–4827. doi: 10.1093/jxb/eraa199

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© The Author(s) 2020. Published by Oxford University Press on behalf of the Society for Experimental Biology.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fig. 1. — The different developmental stages of the secretory cavity in the fruit of Citrus grandis ‘Tomentosa’. (A–C). The initial cell stage. (A) The early stage of the initial cells shows a group of original cells (arrow). (B) The middle stage shows the cap region (arrowhead) and the globular region of the cells (arrow). (C) At the late stage, the cytoplasm in the globular region is no longer dense (arrow). (D) The lumen formation stage of the secretory cavity. The arrow indicates the formation of the secretory space. (E–G). The lumen expansion stage of the secretory cavity. The arrows indicate the lumen. (H). The mature secretory cavity, with the mature lumen indicated by the arrow. The scale bars are 50 μm.