Mediation of β-Endorphin by the Isoflavone Puerarin to Lower Plasma Glucose in Streptozotocin-Induced Diabetic Rats - Chen, Wang-Chuan; Hayakawa, Satoshi; Yamamoto, Tatsuo; Su, Hui-Chen; Liu, I-Min; Cheng, Juei-Tang (Planta Medica, 2004)