1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC), cholesterol (chol), 1,2-distearoyl-sn-glycero-3-phosphoethanolamine-N-[methoxy(polyethylene glycol)-2000] (DSPE-mPEG2000), 1,2-distearoyl-sn-glycero-3-phosphoethanolamine-N-[maleimide(polyethylene glycol)-2000] (DSPE-PEG2000-Mal), 1,2-distearoyl-snglycero-3-phosphoethanolamine-N-[amino(-polyethyleneglycol)-2000] (DSPE-PEG2000-NH2), and 1,2-dioleoyl-snglycero-3-phosphoethanolamine-N-(lissamine rhodamine B sulfonyl) (DOPE-rho) were purchased from Avanti Polar Lipids (Alabaster, AL, USA). 2-S-(4-isothiocyanatobenzyl)-1,4,7-triazacyclononane-1,4,7-triacetic acid was purchased (p-SCN-Bn-NOTA) from Macrocyclics (Dallas, TX, USA). Copper-64 was produced at the Korea Institute of Radiological and Medical Sciences (KIRAMS, Seoul, Republic of Korea) by 50-MeV cyclotron irradiation [56 (link)]. Chloroform, methanol, dimethylformamide (DMF), and triethylamine (TEA) were purchased from Sigma-Aldrich (St. Louis, MO, USA). Cetuximab was purchased from Merck KGaA (Darmstadt, Germany). Amicon filters were purchased from Millipore (Billerica, MA, USA).
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