a) Fluorescent probes such as DAPI are often used to study cells that are in the different phases of cell cycle. DAPI is a fluorescent stain that binds to DNA. The graph shows the variation in fluorescence intensity of human skin cells that were sorted by FACs into 2 populations based on the amount of fluorescence. Which phase(s) of the cell cycle are population A in? Population B? Why did you pick those phases?

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