To identify the specific NK cell subset (CD56low/dim vs. CD 56bright) decreased in the untreated JDM patients, we repeated the flow cytometry to measure the level of CD16 and CD56 expression in six JDM patients with low NK cells, three JDM patients with normal NK, and three healthy pediatric matched controls (Figure 2). The gene discussed is FCGR3A; the disease is juvenile dermatomyositis.