Additional file 4: Fig. S3. Negative controls for in situ PLA performed in U2OS-FGF12-mGFP-myc cells. PLA in U2OS-FGF12-mGFP-myc cells treated with a single antibody or in untreated cells. Nuclei were labeled with NucBlue Live and cells were analyzed with fluorescence microscopy. Scale bar represents 20 μm