To further the applicability of P6 and P9 to target EGFR+ve cancer cells, confocal microscopy was used to observe peptide internalization into EGFRWT H1299 lung cancer cells, EGFRvIII DKMG glioblastoma cells, and EGFR−ve HEK-293 normal cells (Figure 5). Here, EGFR is linked to lung cancer.