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. 2008 May 16;4(5):e1000073. doi: 10.1371/journal.pgen.1000073

Figure 2. Sites of HOXA13 expression during placental labyrinth development.

Figure 2

(A) HOXA13 is expressed in the endothelial progenitors in the E8.0 allantois. (B) HOXA13 expression is maintained in the endothelial progenitors during chorioallantoic fusion at E8.5. (C) Between E8.75 and E9.5, the HOXA13-expressing endothelial progenitors contribute to the developing feto-placental vessels, which mature to form the umbilical artery (UA), chorionic plate vessels, and the vessels contributing to the placental labyrinth (D). HOXA13 is not expressed in the developing umbilical vein (UV).