Schematic representation of all combinations of the APTEDB-PEG2000-DSPE (targeting ligand conjugated PEG) group paired with PEG2000, PEG1000, PEG550 and PEG350 (methoxy-capped PEG lipids) and the APTEDB‑PEG1000-DSPE group paired with PEG1000, PEG550 and PEG350 (methoxy-capped PEG lipids). Left column represents a set of liposomes prepared using the targeting ligand conjugated PEG2000-phospholipid as a key component: APTEDB-PEG2000/PEG2000 LS, APTEDB-PEG2000/PEG1000 LS, APTEDB-PEG2000/PEG550 LS, APTEDB-PEG2000/PEG350 LS. Right column represents a set of liposomes prepared using the targeting ligand conjugated PEG2000-phospholipid as a key component: APTEDB-PEG1000/PEG1000 LS, APTEDB-PEG1000/PEG550 LS, APTEDB-PEG1000/PEG350 LS.