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Figure 2 | BMC Evolutionary Biology

Figure 2

From: Lineage-specific positive selection at the merozoite surface protein 1 (msp1) locus of Plasmodium vivax and related simian malaria parasites

Figure 2

Lineage-specific positive selection in the phylogeny of msp1 from P. vivax and P. vivax -related simian malaria parasite species. The maximum-likelihood (ML) tree topology was constructed using sequences of msp1 codon 3 for (a) the whole msp1 gene, (b) the 5' region, (c) the central region and (d) the 3' region. The estimates of kA and kS (×100) are shown above each branch. Branches showing ω (= kA/kS) >1 are bold-lined. A branch showing ω significantly greater than 1 (P < 0.05), when the free ratio model was compared with the constrained model that fixed ω of the branch of interest at 1, is double-asterisked; and that weakly higher than 1 (P < 0.1) is asterisked. Abbreviations are: Pfi, P. fieldi N-3; Pvi, P. vivax Sal-I; Pcy, P. cynomolgi Smithsonian; Phy, P. hylobati; Pin, P. inui Celebes; Pco, P. coatneyi; Pkn, P. knowlesi H; Pfr, P. fragile NIH; Pgo, P. gonderi.

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