In our previous study [37], we determined IgG and IgA antibody responses to LPS from Escherichia coli (E. coli-LPS), LPS from P. gingivalis (Pg-LPS), and peptidoglycan polysaccharide from Streptococcus pyogenes (PG-PS) in RA patients. The gene discussed is CD79A; the disease is rheumatoid arthritis.