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. Author manuscript; available in PMC: 2022 Sep 23.
Published in final edited form as: Phys Rev E. 2022 Jan;105(1-1):014420. doi: 10.1103/PhysRevE.105.014420

FIG. 2. Panel A: Cell Age PDF.

FIG. 2.

In an exponential culture, there is an enrichment in young cells relative to old cells. The relative number of cells decays exponentially with cell age τ. Panel B: Numbers in an exponential culture. The numbers of all quantities grow exponentially with the same growth rate. For perpetual quantities (e.g. cell number, cell poles, DNA loci) the relative timing of the creation of a quantity can be inferred by the temporal offset of the NX(t) curve relative to the cell number curve N(t). In contrast, transient quantities, like the number of Z rings, also grow exponentially, but their offset cannot directly be interpreted as a time.