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Tumor initiating frequencies of GFPhigh/low cells transplanted into the cleared mammary fat pad A, WMG49 tumor: χ2=7.53, p=0.006; * the 1000 cell point was censored from the calculation to satisfy the goodness of fit to a single-hit Poisson model; B, WMG300 tumor: χ2=10, p=0.0013.
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