Figure S1. Total MHC class II B blue tit alleles obtained from all DNA and cDNA sequences (amplified with the degenerated primers 2ZFfw1 and 2ZFrv1). Identity with allele Cyca-DAB*1 is indicated by dots.

Figure S2. Bayesian phylogeny from the blue tit and other passerines with non-collapsed nodes. Decimal numbers on branches, posterior probability. MHC class II B blue tit alleles are indicated by an arrow.

Table S1. Sample sites, number of individuals sampled and kind of analysis. +, the individual was used for the analysis. −, the individual was not used for the analysis.

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