CD4 and synovial sarcoma: We observed that various types of immune cells were significantly activated both in the IgAN and SS samples, including effector memory (EM) CD8 T cell, T follicular helper (Tfh) cell, type 1 T helper cell, regulatory T cell, natural killer T cell, central memory CD4 T cell, immature B cell, activated B cell, natural killer cell, activated dendritic cell, and myeloid-derived suppressor cell (MDSC).