Figure 4
From: Phosphatidylinositol 3 kinase modulation of trophoblast cell differentiation
'Differentiation-associated' genes are expressed by trophoblast cells developing within the chorioallantoic placenta. In situ detection of mRNA expression of 'differentiation-associated' genes in gestational d11.5 and d18.5 rat placentation sites is presented. Bars = 1 mm. Left panels, d11.5 placentation sites, far left: low magnification; middle left: high magnification of boxed area. Right panels, d18.5 placentation sites, middle right: low magnification; far right: high magnification of boxed area. Red arrowheads, trophoblast giant cells; red arrows, invasive trophoblast giant cells; yellow arrows, spongiotrophoblast; green arrowheads, endovascular invasive trophoblast; green arrows, interstitial invasive trophoblast.