The probabilities of selecting the stem cell for a replenishing division per cell death event.

The data is shown for all combinations of birth and death kinetics in the absence of stem cell death and of fitness differences among mutant cells. The five birth curves are the measured curve from the labeling index, the logistic curve, the uniform curve, and, mirror images of the measured curve and logistics curve with the place of reflection between cell 40 and 41, respectively. Due to the lack of quantitative measurements of the distribution of death as a function of cell position, birth curves are used as proxies for death curves.