<prompt> A variety of basic assays are used to detect autoantibodies. Nephelometry is based on the principle of:Light attenuated in intensity by scatteringRefraction of lightReduced transmission of lightFiltration of solutes by kidney  <response>: Nephelometry measures the interaction of antibodies and antigens in solution, detecting immune complex formation by monitoring changes in the scattering of an incident light. Ref: Imboden J.B. 2007. Chapter 3. Laboratory Diagnosis. In J.B. Imboden, D.B. Hellmann, J.H. Stone Eds, CURRENT Rheumatology Diagnosis Treatment, 2e. 