AIM To investigate changes in IL 8 like immunoreactive substance in the anterior pituitary ( AP) of pregnant rats and rats at different estrous stages and in different estradiol levels in vivo. 目的研究孕鼠和大鼠性周期不同阶段以及大鼠体内雌激素水平变化对垂体前叶(anteriorpituitary,AP)内IL-8样免疫阳性物质表达的影响。