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(A) Frequency of MHC class II DRB nucleotide alleles in 65 individuals. Sixteen alleles were detected in more than 10% of the individuals, whereas more than half of alleles are found in only one or two individuals, but confirmed and validated because they occur in both independent replicates. (B) Box plots of MHC class II allele frequencies divided in intervals of 0.1 and the number of biomes (1–5) in which they occur.
