Figure 7
From: Growth and development of the placenta in the capybara (Hydrochaeris hydrochaeris)
Chorioallantoic placenta of the capybara at around 70 days of gestation. (A) Labyrinth and interlobular area of capybara placenta immunostained for cytokeratin. Note the strong reaction of trophoblast lining a large maternal arterial channel at the center of the lobe. (B) Similar area immunostained for vimentin, which picks out the capillaries of the labyrinth. (C) Immunostaining for PCNA reveals nests of proliferative cytotrophoblast (arrows) underlying allantoic mesoderm at the centre of the placental disk. (D) Immunostaining for PCNA shows that similar, proliferative cytotrophoblast occurs in the labyrinth especially close to the strand of mesoderm carrying the fetal vessel. (E) A nest of proliferative cytotrophoblast is accompanied by a layer of syncytiotrophoblast that lines a maternal blood channel.TEM. (F) Detail of cellular and syncytial trophoblast in this region. TEM. Cyt = cytotrophoblasts, fm = allantoic or fetal mesoderm, fv = fetal vessel, int = interlobar areas, lab = labyrinth, ma = maternal arterial channel, mbc = maternal blood channel, syn = syncytiotrophoblast. Scale bars = 100 μm (A-B), 40 μm (C-D), 10 μm (E) 5 μm (F).