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新元古代甾烷记录综述。左边是地质时间表,日期是几亿年 。箭头表示各种生物标记在高于背景阈值时变得可检测的大致时间 。甾醇通常被基因24-C甾醇甲基转移酶(碳-24)甲基化的位点在麦角甾烷上用箭头标出。鸣谢http://www.uux.cn/attachments/2019/05/1_201905091219121IIp5.jpg|http://www.uux.cn/attachments/2019/0...
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