Table 1.

Summary of diversity in genomic and expressed MHC-I alleles in the house sparrow at the level of the population (total counts of genomic and expressed alleles and percentage expressed) and individual (average counts of genomic and expressed alleles and percentage expressed per individual). Data are presented for both nucleotide and amino acid alleles and classical and non-classical alleles. Individual allele counts are presented as the mean ± s.e.m. of model-fitted values (see table 2 and electronic supplementary material, table S1).

		nucleotide		amino acid
		classical	non-classical	classical	non-classical
genomic	population	68	65	62	39
	individual	5.47 ± 0.46	7.28 ± 0.54	5.29 ± 0.43	5.96 ± 0.46
expressed	population	50 (73.5%)	20 (30.8%)	47 (75.8%)	9 (23.1%)
	individual	3.21 ± 0.36	2.37 ± 0.30	3.02 ± 0.33	2.07 ± 0.27
		(57.2 ± 2.4%)	(37.9 ± 2.5%)	(58.6 ± 2.3%)	(38.6 ± 2.8%)