LAUSR

Visualizing progression through the cell cycle provides valuable information for the study of development, tissue maintenance, and dysregulated growth in proliferative diseases, such as cancer. Developments in fluorescent biosensors have facilitated dynamic tracking of molecular processes, including the cell cycle. The genetically encoded set of fluorescent indicators, Fucci4, enables the visualization of transitions between each cell cycle phase. Here, we describe a method to track progression through each cell cycle phase using Fucci4 in live epifluorescence imaging. In principle, this approach can be adapted to in vitro time-lapse imaging of any four spectrally resolvable fluorescent indicators.