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Fig. 5. Analysis of Lamb1-/- embryos. Arrowheads indicate the embryonic basement membrane, and arrows indicate RM, when present. E5.5 control (A-C) and Lamb1-/- (D-F) embryos were stained for laminin ß1 (A,D); for laminin ß1 (red), cytokeratin 8 (green) and nuclei (blue) (B,E); and for laminin {alpha}5 (red), ctyokeratin 8 (green) and nuclei (blue) (C,F). Note the absence of basement membranes in the Lamb1-/- embryos, other than those associated with the uterine lining (UL). Anti-cytokeratin 8 stains the extraembryonic ectoderm (ExE), the PE and trophoblasts. More trophoblast invasion is apparent in the control than in the Lamb1-/- embryos. EE, embryonic ectoderm. Scale bar in F: 50 µm.