Used in molecular biology and biochemistry to enhance the uptake of nucleic acids into cells, particularly in transfection protocols. It facilitates the binding of DNA or RNA to cell surfaces, promoting endocytosis and improving gene expression in cultured cells. Commonly applied in both adherent and suspension cell lines where other transfection methods may be less effective. Also employed in immunoprecipitation and as a clarifying agent in diagnostic assays due to its ability to precipitate macromolecules. Its positive charge interacts with negatively charged biomolecules, making it useful for separation and purification processes.