LIVE/DEAD Sperm Motility Test Kit provides a new fluorescence detection method that can For analysis of sperm motility and fertilization potential by fluorescence microscopy or flow cytometry. The cell-membrane-permeable SYBR® 14 nucleic acid stain uses green fluorescence to label live sperm, while the cell-membrane-impermeable propidium iodide uses red fluorescence to label nucleic acids in sperm with damaged cell membranes.