The maintenance of regional identity of HFK cells was exemplified by these markers' abundance in EpCAM neg and EpCAM dim fractions as well as by analyzing sorted NCAM expressing cell subpopulations (including its embryonic form, PSA-NCAM) and showing mostly highly significant differences in genes that are well-established early markers of kidney stem/progenitor cells ( Six2, Wt1, Pax2, Cited1, and Sall1 ).
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