Table 2.

Numbers of HLA-A, HLA-B, and HLA-C Alleles/Molecules of the Categories Characterized by the Minimum Numbers of Populations of Our Data Set in Which They Were Observed.

Allele/Molecule Categories	HLA-A	HLA-B	HLA-C	Total
Estimated for binding affinity	894	1,413	622	2,909
Observed in at least one population	213	350	153	716
Observed in at least 5 populations (common)	67	127	46	240
Observed in at least 10 populations	47	86	37	170
Observed in at least 25 populations	32	52	24	108
Observed in at least 50 populations	14	26	20	60
Observed in at least 75 populations (most common)	9	9	13	31

Null alleles, which are not suitable for peptide-binding affinity estimation, were not included.