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. 2022 Mar 28;12:5259. doi: 10.1038/s41598-022-08972-w

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© The Author(s) 2022, corrected publication 2023

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Precise development of each element of the sphenoid. In histological sections, elements that were still cellular condensation were counted as 0.5, and those that produced cartilaginous matrix were counted as 1. Then, the value in each stage was summed up and divided by the number of all specimens, and the developmental rate of each element was calculated. A specific color or pattern was assigned to each 10% of the developmental rate.