The mRNA expression levels of IgG4-specific class switch-related molecules in PBMCs and LSGs. The displayed mRNA expression levels are relative to the mRNA level of GAPDH, representing the internal control. Data are expressed as mean ± SD. *P < 0.05, Mann-Whitney U test. PBMCs, peripheral blood mononuclear cells; LSGs, labial salivary glands; HC, healthy control; SS, Sjögren syndrome; IgG4, IgG4-RD.
Tsuboi et al. Arthritis Research & Therapy 2012 14:R171 doi:10.1186/ar3924