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. 2024 Dec 20;24:1218. doi: 10.1186/s12870-024-05964-y

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© The Author(s) 2024

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Fig. 7 — Selective pressure analysis results. a Cluster heatmap showing the Ka/Ks values of chloroplast genomes from 19 species, using Hydrocera triflora as a reference, the Ka/Ks value varies between 0 and 2, corresponding to a colour range of blue to red. b A set of graphs displaying the Ka/Ks values of each gene