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Immunoprecipitation (IP) is a biochemical technique to precipitate a protein out of solution using an antigen that can specifically bind to that protein. IP can be performed to isolate and concentrate one particular protein from a sample of thousands of different proteins. IP is also readily performed to pull down interacting proteins of complexes out of solution. This protocol outlines the methods used to IP proteins in whole worm lysates and their preparation for detection on Western blots using denaturing conditions.