RIGI and dermatomyositis: DM patients exhibited significantly higher levels of RIG-I mRNA (0.091 ± 0.051 vs. 0.052 ± 0.024, p = 0.011) and RIG-I protein (0.30 ± 0.18 vs. 0.18 ± 0.08, p = 0.005) in peripheral T lymphocytes than those in healthy control subjects (Fig. 3a).