T cells in the labial glands of SS patients have also been shown to exhibit c-Jun N-terminal kinase (JNK) pathway activation [150] and to express B cell activating factor (BAFF) [151], though these findings were not specific to CD8+ T cells, as they also occurred in CD4+ infiltrating T cells, and their significance is at present unclear. Here, CD4 is linked to synovial sarcoma.