Hahn博士发现，9处鳉鱼的AHR的胺基酸链中，不同个体间是相连的，共找出26处。
Dr Hahn has, however, found nine places along the amino-acid chain of killifish AHR where the link in the chain varies between individuals. Altogether, he has identified 26 such variations.
要留意所观察的对象。找出情况与问题中的相似处、不同处以及独特的显著特征。
Be alert in your observations. Look for similarities, differences, as well as unique and distinguishing features in situations and problems.
考考你的眼力，你能在这两幅图中找出10处不同吗？
There are 10 differences hidden in the two pictures. Can you find them?
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