(A) A self-renewing stem cell is labeled with a specific marker (green). All cells in the hierarchy are permanently marked in long-term follow up.
(B) Specific labeling of mature, differentiated cells. If these cells are replaced by a mature stem/progenitor, the label will disappear from the mature population with time.
(C) A progenitor, not capable of indefinite self-renewal, is labeled. After short follow-up, multiple lineages are marked. However, the marked cells disappear after longer times.