It's hardly clear that there is a causal relationship between optimism and health; it could be that they are related to the same underlying gene complex or set of mechanisms.
乐观的生活态度与健康之间是否有着因果关系尚难明确；有可能是相同的潜在基因综合体或者是某种生理结构使之然。
HLA is the most polymorphic gene complex of all human genetic systems, play a key role in specific immune response, determine the heterogeneity of individual associated with disease.
HLA是迄今所知最为复杂的遗传多态性系统，是调控人体特异性免疫应答和决定疾病易感性个体差异的主要基因系统。
HLA is the most polymorphic gene complex of all human genetic systems, play a key role in specific immune response, determine the heterogeneity of individual associated with disease.
HLA是迄今所知最为复杂的遗传多态性系统，是调控人体特异性免疫应答和决定疾病易感性个体差异的主要基因系统。
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