Files in this Data Supplement:

• Supplemental file 1 - Fig. S1 (Erf probe specificity), S2 (Erf^dl1/dl1 embryo phenotypes), S3 (Erf^dl1/dl1 embryos have increased yolk sac hematopoiesis), S4 (Erf^dl1/dl1 placentas have extended giant-cell layers), S5 (Different cell populations express Gcm1 and Erf in the mouse placenta), S6 (Increased chorion proliferation in Erf^dl1/dl1 placentas), S7 (Expression of TSC markers in Erf^dl1/dl1 and wt cells), S8 (Erf^dl1/dl1 trophoblast stem cells can differentiate towards giant cells), S9 (Apoptosis in Erf^dl1/dl1 placentas and embryos), S10 (Induction of hypoxia marker Hif1a in Erf^dl1/dl1 embryos and placentas), and S11 (Erf^dl1/dl1 embryos have normal cardiovascular systems)
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