CD19 and polymyositis: Additionally, we have identified several novel findings in polymyositis, including the potential roles of IgD‐ CD38dim B cells, CD80 on CD62L+ myeloid dendritic cells, SSC-A on HLA DR+ natural killer cells, CD27 on IgD‐ CD38dim B cells, plasma blast–plasma cell %B cells, CD19 on switched memory B cells, unswitched memory B cells, CD38 on IgD+ CD24‐ B cells, CD14 on CD33dim HLA-DR+ CD11b+ cells, FSC-A on natural killer cells, CD39+ CD8+ T cell absolute count, and CD4 on CD39+ CD4+ T cells.