<prompt> Which precipitates at 50 oC-60 oC but disappears on heating -Heavy chainLight chainBothNone of the above  <response>: Light chain is tested by heating urine to 140degF 60degC. At this temperature, the Bence Jones proteins will clump. The clumping disappears if the urine is fuher heated to boiling and reappears when the urine is cooled. Reff: Ananthanarayan Panikers textbook of microbiology 9th edition pg:99 