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Cell lineage model. Transit cells of j-type cells divide at a rate vj producing two j-type cells with probability pj or two (j + 1)-type cells with probability 1 − pj. Stem cells S divide at a rate r. There are k + 1 intermediate steps until cells become fully differentiated (D). Once they do they exit the cell cycle and die at a certain rate d. (Online version in colour.)
