Immunohistochemistry (IHC) staining using antibody CD34 (vascular marker) revealed brown-stained areas at the edges, indicating newly formed microvessels, while non-brown areas represented old endothelial tissue. Arrows highlight the appearance of new microvessel growth in the placental tissue. The highest microvessel density was observed in the KP2 group (E) (prednisone + EAG), while the lowest density was found in the positive control group KN (B). A. Pregnant control rats; B. pregnant with asthma; C. Prednisone treatment; D. EAG treatment; E. prednisone + EAG treatment. Abbreviations: Ovalbumin (OVA). Scale bars: 50 μm (A–E).