| http://www.w3.org/ns/prov#value | - RIA is a competitive assay, that is the nonradioactive thyroxine competes with a constant amount of 125 I-T4, where 125 I is radioactive iodine that is substituted for the iodine attached to a thyroxine molecule, for binding sites on a limited amount of T4 antibody receptors coupled to some solid phase, such as beads.
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