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Rules of attribution of the IEF profiles observed for the four possible genotypes. Ii, class I allele; IIk, class II allele; Am, ambiguous allele; ?, no detection. Thin lines, unambiguous attributions, identical under the three assumptions. Thick solid lines, lowest estimates. Dashed lines, highest and intermediate estimates. These two assumptions differ for attributions indicated by the asterisk (see main text).
