SSX1 and synovial sarcoma: Nuclear proximity ligation signal is detectable between SS18 and TLE1 in all six tested synovial sarcoma patient derived cell lines: SYO-1 (SS18-SSX2), FUJI (SS18-SSX2), MoJo (SS18-SSX1) (Figure 1A); Yamato-SS (SS18-SSX1), and ASKA-SS (SS18-SSX1) (Supplementary Figure 1C); and CME-1 (SS18-SSX2) (Figure 2B).