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The population of transit amplifying cells is maintained through supply from stem cells and expense to cell commitment.
These Ascl1 lineage results combined with localization of Ascl1 in Nestin::GFP+/GFAP+ cells in the adult SGZ demonstrate that Ascl1 is present in a population of cells with persistent neurogenic potential beyond that expected from a population of transit amplifying Type-2 cells.
The final solution is as follows:
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After this publication, it seems questionable (or controversial at the very least) whether it is correct to refer to a proximal population of "transit-amplifying cells" in this system (as in Figure 1A here).
To tailor the model to be species-specific, information about the populations of transit amplifying cells, differentiated cells and in vivo dividing frequency of stem cells will be evaluated based on experimental results.
The overall workflow of the model is illustrated in Figure 2. Based on the assumptions mentioned earlier and using measured populations of transit amplifying (TA) cells and differentiated cells, the optimization formulation will find out the stem cell number as well as the adaptive changes.
Luckily, Transit says it already has the highest user population of any transit app in North America, so if anyone can make this work, it should be able to.
This is important as unrestrained expansion of transit amplifying population will lead to development of cancer.
The expansion of stem cell pool supports a transient expansion of transit amplifying population up to 14.5% (equivalent to one to two cells; Figure 5).
Results of tissue restitution following 50% reduction in differentiated epithelium are shown in Figure 3B, where the epithelium renewed 35% faster than normal and the pool of stem cells expanded from 4.1 to 8.1 per section of crypt (Figure 4B), accompanied by a transient expansion of transit amplifying population up to 14.7% (equivalent to one to two cells; Figure 5C).
Results are shown in in Figure 3B, where the epithelium renewed 40% faster than normal and the stem cells expanded from 4.3 to 8.6 per section of crypt (Figure 4C), accompanied by a transient expansion of transit amplifying population up to 11% (equivalent to one cell; Figure 5C).
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com