The SureLight Glow firefly luciferase cell viability assay provides a homogeneous and highly sensitive method for quantifying ATP, an indicator of cell viability, in cell cultures. The assay generates a stable, glow-type luminescent signal directly proportional to the amount of viable cells present in the cell culture. SureLight® Glow meets or exceeds the specifications and performance of leading competitors at a greater than 40% cost savings.