sentences:  Under conditions of homeostasis, adult stem cells should be dividing asymmetrically so that the same number of adult stem cells is maintained in the tissue compartment.After pulsing for long enough to label all the newly replicated DNA, the DNA label is chased out (each DNA replication now incorporates unlabeled nucleotides) and the adult stem cells are assayed for loss of the DNA label after two cell divisions.If cells are using a random segregation mechanism, then enough DNA label should remain in the cell to be detected.