In situ hybridizations for Gcm1, Synb, Cebpa, Cebpb and Syna on 10 μm sections of E9.5 Gcm1+/− (Het) and Gcm1−/− (Gcm1 KO) mouse placentas and Cebpa+/−;Cebpb+/− (Double Het), Cebpa−/− (Cebpa KO), Cebpb−/− (Cebpb KO) and Cebpa−/−;Cebpb−/− (DoubleKO) placentas. al, allantois; ch, chorion; f, fetal blood space; m, maternal blood space. Scale bars: 100 μm.