内源及外源性阿片具有调节神经元与胶质细胞的功能，这些调节具有保护或损伤脑功能的双重作用。
Endogenous and exogenous opioids can influence and modulate neuronal and glial cell function via an opioid receptor mediated mechanism, leading to either protection or damage of the brain.
目的：观察急性缺氧时血浆、组织内源性一氧化碳的变化及外源性一氧化碳对急性肺动脉高压的影响。
AIM: To investigate changes of carbon monoxide (CO) in plasma and tissue during acute hypoxia and effect of exogenous CO on acute hypoxic pulmonary arterial hypertension.
细胞色素P 450 3a4在许多内源性及外源性化合物的氧化及还原代谢中起关键作用，对CYP3A4基因表达的研究具有重要意义。
Human cytochrome P450 3a4 plays a dominant role in the metabolic of endogenous and exogenous compounds. Study on the gene expression of CYP3A4 shows essential importance.
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