| http://www.w3.org/ns/prov#value | - Furthermore they may be modified to include or carry a targetting vector, e.g. a species serving to cause the particles to accumulate at a desired target site, for example superparamagnetic crystals which allow the particle to be accumulated at a target site by application of an external magnetic field, or a drug, antibody, antibody fragment or peptide (e.g. an oligopeptide or polypeptide) which h
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