DDR2 and lung carcinoma: In this study (Kim et al., 2015), the AuNP-Apt-based protein delivery system was used to transport peptides containing DDR2 hexahistidine (His) or glutathione S-transferase (GST) labelled transmembrane proximal 1/2 (TM-JM1/2) domain to lung cancer cell lines (Figure 3F).