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30 Warburg, O., Wind, F. & Negelein, E. The metabolism of tumors in the body. J. Gen. Physiol. 8, 519–530 (1927). Reference 29 is an important work in which the consumption of glucose and production of lactic acid in tumours transplanted in rats were measured directly and compared with the corresponding metabolism by normal tissues. Reference 30 is an English translation of reference 29.

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