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(a) Plasmodium ashfordi GRW2 infection intensity in great reed warblers with 5–10 MHC alleles (mean value: 7.2 alleles). (b) Plasmodium relictum GRW4 infection intensity in great reed warblers with 3–10 MHC alleles (mean value: 6.4 alleles). Individuals that carry the MHC-I allele B4b are denoted with filled circles and individuals that do not carry B4b are denoted with open circles.
