LDS-751 is widely used in biological research as a fluorescent dye, particularly for cell staining and flow cytometry. It is highly effective for labeling nucleic acids, especially DNA, in live and fixed cells. Its ability to bind to DNA makes it a valuable tool for cell cycle analysis, allowing researchers to distinguish between different phases of the cell cycle based on fluorescence intensity. Additionally, LDS-751 is often employed in cell viability assays, as it can differentiate between live and dead cells by selectively staining dead cells with compromised membranes. Its red fluorescence emission makes it suitable for multicolor experiments, enabling simultaneous detection with other fluorophores. This dye is also utilized in studies involving apoptosis, cell sorting, and other cellular processes where DNA quantification and visualization are critical.