Wild type C57BL6/N (C57BL/6NTac, 8–10 weeks old) and Swiss-Webster (8–10 weeks) mice were purchased from Taconic. The UBC-GFP (C57BL/6-Tg(UBC-GFP)30Scha/J, 8–13 weeks old; JAX #004353)(Schaefer et al., 2001 (link)) and R26R–YFP (B6.Cg–Gt(ROSA)26Sortm3(CAG−EYFP)Hze/J; JAX #007903) (Madisen et al., 2010 (link)) mice were obtained from the Jackson Laboratory. The Nkx3-1Cre allele has been previously described (Lin et al., 2007 (link); Thomsen et al., 2008 (link)). As hosts for renal grafts, R2G2 mice (B6;129- Rag2tm1FwaIl2rgtm1Rsky/DwIHsd, 8–15 weeks old) were purchased from Envigo, and NOD/SCID mice (NOD.Cg-Prkdcscid/J, 8–14 weeks old; JAX #001303) were purchased from the Jackson Laboratory. To obtain urogenital mesenchyme for tissue recombination and renal grafting, we used E18 Sprague-Dawley rat embryos from timed matings (Charles River #400). Animal studies were approved by and conducted according to standards set by the Columbia University Irving Medical Center (CUIMC) Institutional Animal Care and Use Committee (IACUC).
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