In normal human tissues, low to high expressions of BCRP in placental syncytiotrophoblasts, in the epithelium of the small intestine and colon, in the liver canalicular membrane, in ducts of the breast, in endothelium of the blood vessel and in stem cells were reported. 人体正常组织中胎盘合体滋养层细胞、小肠和结肠粘膜上皮细胞、胆小管膜、乳腺小叶及血管内皮细胞和干细胞均能检测到BCRP的表达;