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. 2020 Sep 10;3:501. doi: 10.1038/s42003-020-01234-3

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© The Author(s) 2020

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Fig. 7 — a and b scenarios suggest one ancestral Noggin gene passed through two rounds of duplication (2 rounds of whole-genome duplication in a vs local+whole-genome duplications in b). c scenario suggests two ancestral Noggins passed through one round of whole-genome duplication.