| http://www.w3.org/ns/prov#value | - One aspect of the present invention is a method for detecting the presence of or determining the amount of a ligand in a fluid sample comprising (a) providing a first reagent comprising a sol particle having a detectable physical property bound to the ligand or ligand analogue (in a competitive format) or a substance capable of specifically coupling with the ligand (in a sandwich format); (b) prov
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