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(A) DNA aptamer specific for Protein Tyrosine Kinase (PTK)7 (green) linked to 15 consecutive guanines, the AptG15 [56]. (B) G4-based drug delivery carriers (GDDC) loaded with an anionic copper(II) phthalocyanine (blue square).The GDDC presents a loop (red), which can hybridize with epidermal growth factor receptor mRNA [57].
