We used two sets of two-color break-apart FISH probes, flanking either the SSX1/SSX4 or SSX2 locus.     ///    "This assay can detect translocation at either SSX1/SSX4, or SSX2 locus on interphase spread prepared from synovial sarcoma cell line and histopathological sections, which is sufficient to diagnose as synovial sarcoma. "    ///    "Each set of probes is composed of differentially labeled DNA fragments complementary to sequences proximal or distal to the break point within the SSX1/SSX4 or SSX2 locus, which are applied separately to histopathological sections. "