Supplementary figure 1 from Secondary Tumors Arising in Patients Undergoing BRAF Inhibitor Therapy Exhibit Increased BRAF–CRAF Heterodimerization

Proximity Ligation Assay principle. Two primary antibodies recognize the two antigens BRAF and CRAF. Specific secondary antibodies (Probes) bind to the primary antibodies and are bound to a unique short DNA. When the PLA probes are in close proximity, the DNA strands can interact. After joining they are amplified via rolling circle amplification (RCA) using a polymerase. The signal is easily made visible as a distinct brown or fluorescent dot after enzymatic conversion of a substrate.