1. Enders, A. C., Given, R. L. & Schlafke, S. Differentiation and migration of endoderm in the rat and mouse at implantation. Anat. Rec. 190, 65–77 (1978).
2. Gardner, R. L. & Rossant, J. Investigation of the fate of 4.5 day post-coitum mouse inner cell mass cells by blastocyst injection. J. Embryol. exp. Morph. 52, 141–152 (1979).
3. Byrd, N. et al. Hedgehog is required for murine yolk sac angiogenesis. Development 129, 361–372 (2002).
4. Damert, A., Miquerol, L., Gertsenstein, M., Risau, W. & Nagy, A. Insufficient VEGFA activity in yolk sac endoderm compromises haematopoietic and endothelial differentiation. Development 129, 1881–1892 (2002).
5. Rossant, J. & Tam, P. P. Blastocyst lineage formation, early embryonic asymmetries and axis patterning in the mouse. Development 136, 701–713 (2009).