CD1, C57BL/6 J wild-type, B6.SJL-Ptprca Pep3b/BoyJ, SCID-Beige mice (Charles River Laboratories), Jag1−/− (ref. 30 (link)), β-actin-GFP (ref. 31 (link)) and ROSAeYFP (ref. 32 (link)) N1IP::CreLO (ref. 17 (link)) and N1IP::CreHI (ref. 19 (link)) strains were used. Animals were kept under pathogen-free conditions, and all procedures were approved by the Animal Care Committee of the Parc de Recerca Biomedica de Barcelona (regulation of Generalitat de Catalunya). Embryos were obtained from timed pregnant females and staged by somite counting: E10.5 (31–40 sp) E11.5 (43–48 sp). The detection of the vaginal plug was designated as day 0.5. Mice and embryos were genotyped using PCR when justified.
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