Protein interaction research focuses on the study of how proteins interact with each other to perform various biological functions within cells. These interactions can involve physical binding between proteins, signaling pathways, enzyme-substrate interactions, and other molecular interactions. Understanding protein interactions is crucial for elucidating the mechanisms underlying cellular processes and diseases, as well as for designing targeted therapeutics. Researchers use a variety of techniques, including protein-protein interaction assays, co-immunoprecipitation, yeast two-hybrid screening, and mass spectrometry, to study protein interactions.