Used as a fluorescent stain in biological research to highlight RNA in electrophoresis and microscopy. It helps in distinguishing RNA from DNA in gel electrophoresis due to its specific binding properties. Also employed in histology to stain tissues for better visualization under a microscope. Additionally, it serves as a photosensitizer in photodynamic therapy for treating certain medical conditions. Its ability to penetrate cell membranes makes it useful in studying cellular structures and processes.