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Hierarchical clustering of non-synonymous mutations in CHIK samples. A total of thirty-nine non-synonymous mutations was observed in the structural (E1, E2, E3, C, and 6K/TF) and non-structural (nsP1, nsP2, nsP3, and nsP4) protein genes in a total of forty-one samples collected between 2010 and 2016. The blue colour represents the absence of mutation in the respective sample, while the red colour shows the mutation’s presence.
