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Protein-protein interactions play key roles in nuclear processes including transcription, replication, DNA damage repair, and recombination. Co-immunoprecipitation (Co-IP) followed by western blot or mass spectrometry is an invaluable approach to identify protein-protein interactions. One of the challenges in the Co-IP of a protein localized to nucleus is the extraction of nuclear proteins from sub-nuclear fractions without losing physiologically relevant protein interactions. Here we describe a protocol for native Co-IP, which was origina