| http://www.w3.org/ns/prov#value | - For example, there is a method which comprises adsorbing and fixing an antibody (or an antigen) on and to the surface of gold particles deposited on a solid substrate, and visually observing changes in the color of the reflected light which occur as a result of an increase in the thickness of a layer of an immobilized antibody (or antigen) by an antigen-antibody reaction (U.S. Pat. No. 3,979,184).
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