Figure 1From: The placental cholinergic system: localization to the cytotrophoblast and modulation of nitric oxideHuman placenta obtained at 23 weeks gestation was stained with anti-ChAT antibody as previously described. Panels A-C: Positive staining is noted in the cytotrophoblast layer and some cells within the mesenchymal compartment (100×). Panel D: Non-immune serum (40×).Back to article page