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Cell specific ligand molecules are attached to polyethylene glycol (PEG) modified nanoparticles to enhance the drug delivery efficiency. The tethered PEG would interfere in ligand recognition as well as providing biocompatibility to the nanoparticles. The denser PEG can give the greater biocompatibility, while should more hamper the ligand recognition. Therefor it is important to tune PEG density...
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