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Objective:To study the antinociceptive effects of adrenal medullary allografts into the spinal subarachnoid space in chronic pain model rats. 目的：研究同種異躰腎上腺髓質(zhì)植入蛛網(wǎng)膜下腔對慢性痛模型大鼠痛行爲(wèi)的影響及其發(fā)生機制。