CD40LG and rheumatoid arthritis: RA serum IgM was 3.1%, 23.0% and 32.3%; RA serum IgG was 9.3%, 20.6% and 39.4%; control serum IgM was 1.4%, 9.7% and 12.5%; control serum IgG was 22.1%, 22.1% and 33.8%, when using 0.5 μg/μl, 5 μg/μl and 50 μg/μl inhibitor molecules, respectively.