When man prepares such things as foods and drugs, he can keep track of the materials he uses, and thus he will know what the finished product will be made of. But when man tries to take apart some of the enormously complex mixtures of organic chemicals that have been made by naturemost notably, the hundreds of enzymes and other proteins in his own blood, the scores of hormones secreted by his glands, or the dozen antibiotics that may be made in a single fermentation brewhe scarcely knows where to begin. For...
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