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美国国家航空航天局（NASA）的“好奇号”火星车在火星古湖床岩石样本中发现了3种长链烷烃分子——癸烷、十一烷和十二烷。科学家推测，这些分子可能是脂肪酸的热解产物，而脂肪酸是地球生命细胞膜的重要组成部分。相关研究发表在3月24日的《Pro-ceedings of the National Acade-my of Sciences》上。

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