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The Arg–Gly–Asp (RGD) peptide sequence was conjugated to poly (lactid acid), (PLA), microcapsules. These hollow, biodegradable PLGA microcapsules were developed in our laboratory for use as ultrasound contrast agents. By modifying the surface of the agent with a targeting ligand, it can be targeted to a specific address within the body. This application is ideal for both targeted imaging and/or targeted...
Agents injected parenterally must be less than ∼8 μm diameter in order to traverse the capillaries in the pulmonary bed, but these agents remain in the vasculature until they are eliminated from the body by a variety of mechanisms. Targeting of cells outside the capillaries requires agent diameters of less than ∼700 nm to enable escape through the larger-than-usual pores that have been noted in the...
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