Mutant SS18(3M)-SSX1 proved its incapability of colocalizing with BRG1, whereas SS18-SSX1-WT was able to recruit BRG1 into the phase-separated condensates in cells HEK293T and synovial sarcoma cell-line HS-SY-II or CME-1 (Fig. 5h and Supplementary Fig. 4d). Here, SSX1 is linked to synovial sarcoma.