HNRNPA2B1 and hepatocellular carcinoma: As hnRNPA2B1 is reported to transport various RNAs into exosomes [37], the interaction between circCCAR1 and hnRNPA2B1 was evaluate and found that circCCAR1 could bind to hnRNPA2B1 by RIP and RNA pull-down assays in HCC cells (Fig. 7K-L).