"To describe the overwhelming life of a tropical forest just in terms of inert biochemistry and DNA didn't seem to give a very full picture of the world."

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My main thesis will be that in the study of the intermediate processes of metabolism we have to deal not with complex substances which elude ordinary chemical methods, but with the simple substances undergoing comprehensible reactions... I intend also to emphasise the fact that it is not alone with the separation and identification of products from the animal that our present studies deal; but with their reactions in the body; with the dynamic side of biochemical phenomena.

— Frederick Gowland Hopkins