Table 1.

Summary of the promiscuity analysis of HLA class I ligands based on IEDB MHC binding data

Category	Number of ligands	Percentage of ligands (%)
All HLA class I ligands from IEDB (Tested on at least six HLA class I alleles)	3,738
Unique ligands	1,062	28
Promiscuous ligandsa	2,676	72
Promiscuous ligands across serotypesb	2,526	68
Promiscuous ligands across supertypes c	1,751	47
Promiscuous ligands across loci d	864	23

^aThe number of ligands that bind at least two different HLA alleles

^bThe number of ligands that bind at least two different serotypes

^cThe number of ligands that bind at least two different HLA supertypes

^dThe number of ligands that bind at least two different HLA loci