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'A scientist who studies' means 'Psychologist' in context; usage confirms synonymy.
Ref: Cambridge Dictionary vocabulary context confirms word meaning compiled gathered collected from authentic manuscript sources accurately verified standard reference.
Radioimmunoassay developed by Solomon Berson and Rosalyn Yalow 1960 represented first method achieving picogram sensitivity for protein hormone quantification, earning Nobel Prize Physiology 1977. Principle competitive: fixed limiting amount of specific antibody incubated with constant amount of radiolabeled antigen tracer and variable unlabeled sample. Radiolabel typically iodine-125 introduced onto tyrosine residues via chloramine T oxidation producing reactive iodonium ion electrophilically substituting aromatic ring or via lactoperoxidase enzymatic iodination preserving biological activity
Ref: Berson & Yalow J Clin Invest 1960 39:1157 Radioimmunoassay iodine-125; Lodish Molecular Biology competitive binding tracer.
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