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Fig. 1. Expression of endothelial cell markers in the yolk sacs. (A) lacZ
staining for endoglin, in Eng+/ mice with
ß-gal knocked into the endoglin locus. (B-D)
Immunohistochemistry for PECAM1 (B), Flk1 (C) and endoglin (D) in wild-type
yolk sacs. Yolk sac was sectioned in plastic following staining as whole
mounts in all cases. Scale bar: 0.5 mm. Abbreviations: EC, endothelial cell
layer; end, endoderm; mes, mesothelial cell layer.