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Graphical plot showing the re-distribution of the rodent malaria parasite genes after removing the PIR genes. Most of the reduction occurs in the group Py-Pb-Pc in which all the three rodent malaria parasite species share a common gene. (Legend: Py = genes specific to P. yoelii; Py-Pb = genes common to both P. yoelii and P. berghei; Py-Pc = genes common to both P. yoelii and P. chabaudi; Py-Pb-Pc = genes common to all three species)
