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Phylogenetic tree based on the nonrepeat region of the circumsporozoite protein genes of Plasmodium sp. produced by the neighbor-joining method. Clones highlighted in bold are obtained from Singapore isolates and clustered in the Plasmodium knowlesi clade. Clones highlighted are from human isolates, whereas those highlighted and underlined are from monkey isolates. Figures on the branches are bootstrap percentages based on 1000 replicates, and only those above 70% are shown.
