| http://www.w3.org/ns/prov#value | - The agents can be radiolabelled, fluorescently labelled, enzymatically labelled and/or include dyes or magnetic compounds and other materials that can be detected using x-rays, ultrasound, magnetic resonance imaging (???MRI???), positron emission tomography (PET), computer assisted tomagraph (???CAT???), single photon emission computerized tomography, fluoroscopy or other commonly used diagnostic
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