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. 2016 Oct 26;6:35634. doi: 10.1038/srep35634

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(a) Divergence estimation based on single-copy orthologs. The brown box indicates the earliest fossil record of Acrostichum. (b) K_s distribution between A. aureum and A. speciosum. (c) K_s distribution between Acrostichum and Ceratopteris.