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Am J Dis Child. 1911;II(3):189-209. doi:10.1001/archpedi.1911.04100090042004.
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Before going into a general description of nitrogen metabolism it is of the utmost importance to get a general idea of the newer facts known in regard to protein bodies. Protein bodies represent a highly complex organic combination which has become better known through the studies of Hochmeister, Kossel, and especially of Emil Fisher.

The researches of Emil Fisher, Abderhalden, Bergel, Bona and others show that the end-products of the proteins, are the amino-acids obtained by hydrolysis, and are bodies of the normal fat and aromatic series in which the H atom is displaced by an NH2 group. Of these acids many varieties have been described, of which the better known are glycocoll, alanin, tyrosin, valin, leucin and isoleucin. Whereas the carbohydrate (glycogen) of the body represents combinations of a definite chemical group, the glucoses, and the fats a combination of glycerin and fatty acids, the proteins on the


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The American Medical Association is accredited by the Accreditation Council for Continuing Medical Education to provide continuing medical education for physicians. The AMA designates this journal-based CME activity for a maximum of 1 AMA PRA Category 1 CreditTM per course. Physicians should claim only the credit commensurate with the extent of their participation in the activity. Physicians who complete the CME course and score at least 80% correct on the quiz are eligible for AMA PRA Category 1 CreditTM.
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