I think that is the question the Spencer should ask in the next interview. In the mice tests, they marked the injected cells with fluoresence I believe so that they were able to distinguish between brand new follicles which all had flourescent markers compared with pre-existing follicles that maybe only had a couple of new dsc cells that were recruited into existing follicles. I guess that is a question whether injected cells were marked in some way? It seems that may not be safe.
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