"It is what we know already that often prevents us from learning."
"The first entirely vital action, so termed because it is not effected outside the influence of life, consists in the creation of the glycogenic material in the living hepatic tissue. The second entirely chemical action, which can be effected outside the influence of life, consists in the transformation of the glycogenic material into sugar by means of a ferment."
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Source: Claude Bernard (2012). “An Introduction to the Study of Experimental Medicine”, p.239, Courier Corporation
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