| http://www.w3.org/ns/prov#value | - For example, biomolecules such as phospholipids may be attached to the surface of the microsphere to prevent endocytosis by endosomes; receptors, antibodies or hormones may be attached to the surface to promote or facilitate targeting of the microsphere to the desired organ, tissue or cells of the body; and polysaccharides, such as glucans, or other polymers, such as polyvinyl pyrrolidone and PEG,
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