The patterns generated are used as descriptors of simple or complex chemical stimuli and in this way a library of gas and odor "signatures" can be built up.

所产生的模型被用做简单或复杂化学刺激的描述符，并且以这种方式建立一个气体和气味“名片”图书馆。

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This was how simple chemical gradients in an embryo could result in complex body patterns.

ECONOMIST: Genetic engineering