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We demonstrate here that polyethylene glycol (PEG) 6,000 protects biodegradable poly(D,L-lactic acid) nanoparticles (PLA NP) from extensive uptake by monocytes in plasma. These results are in agreement with those previously obtained with PEG 20,000 which reduced the uptake of PLA NP by human monocytes in phosphate buffered saline and plasma, and prolonged the NP circulation time in vivo. The coating...