Table II. Conservation of natural HLA-B*27 cellular peptides with sequences of bacteria associated with B*27-dependent reactive arthritis.

Bacteria	Number of bacteria peptides with the indicated changes versus human liganda
	1 change	2 changes
C. jejuni	1	18
Chlamydia trachomatis	0	4
C. difficile	1	34
P. copri	2	35
S. typhimurium	1	18
Shigella flexneri	0	24
Y. enterocolitica	1	47

^a Only the peptides with P2 anchor motif for HLA-B*27:05 binding were considered.