Incucyte® Nuclight Lentivirus Reagents enable efficient, non-perturbing, nuclear labeling of living mammalian cells. They are compatible with convenient transduction protocols and enable real-time cell counting and the calculation of cell doubling times. Incucyte® Nuclight NIR Lentivirus provides homogenous expression of nuclear-restricted iRFP713 (NIR fluorescent protein, pseudo-colored blue below) in your choice of primary, immortalized, dividing, or non-dividing cells without altering cell function and with minimal toxicity. This reagents is ideal for generating stable cell populations or clones using puromycin selection. The Incucyte® Nuclight NIR Lentivirus has been validated for use with the Incucyte® Live-Cell Analysis Systems configured with an Orange/NIR or a Green/Orange/NIR Optical Module.