Frequencies (number of individuals that carry an alleles/total number of individuals) of 21 blue tit MHC-I alleles.

421 individuals were screened for MHC genotype and 17 MHC alleles that occurred in more than five individuals were included in statistical analyses for infection status (bold). Allele 250 was excluded from the analysis on infection intensity since it only was found in three infected individuals.研究对421名受试者进行了主要组织相容性复合体（Major Histocompatibility Complex，MHC）基因型分型检测，最终纳入17个在5名以上受试者中出现的MHC等位基因，用于感染状态的统计学分析（已标注为粗体）。等位基因250因仅在3名感染受试者中被检出，被排除于感染强度的相关分析之外。