NR4A1AS and hepatocellular carcinoma: In immunofluorescence assay using confocal microscopy, co-localization of Dil-labeled exosomes (red) and FAM-labeled lncMMPA (green) was noticed in the HCC cells following incubation with exosomes, implying that the exosomes-mediated transfer of lncMMPA could occur between macrophage and Hep3B cells (Fig. 4D).