Goldstein等新近的研究表明,在大鼠的脑、垂体和脊髓中,强啡肤A(Dynorphin,十七肽)和强啡肽B(Dynorphin B,或称Rimorphin,十三肽)共存于同一神经元,它们来源于同一前体。我们曾报告强啡肽A在脊髓中有强烈镇痛作用,强啡肽B有何生理作用至今未见报道。本工作将强啡肽B注射到大鼠 Recent studies by Goldstein et al. Showed that Dynorphin A and Dynorphin B (Rimorphin, thirteen peptides) co-exist in the same nerve in rat brain, pituitary and spinal cord Yuan, they come from the same precursor. We have reported that dynorphin A has a strong analgesic effect in the spinal cord. The physiological role of dynorphin B has not been reported so far. In this work, dynorphin B was injected into rats