Subsequently, we observed that both SS18-SSX1 and the mutant SS18(3M)-SSX1 show a more dense puncta-like cluster, distributed in cells HEK293T and synovial sarcoma cell-line HS-SY-II or CME-1, when compared to SS18 puncta previously shown in Fig. 4e (Fig. 5f and Supplementary Fig. 4c). Here, SS18 is linked to synovial sarcoma.