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Nitrogenous substances in urine nitrogen, urea, creatine, creatinine, guanidine, ... urine: alanine, carnosine, glycine, histidine, leucine, lysine, methionine, ...
http://en.wikipedia.org/wiki/Human_urine
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adam.about.com
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en.wikipedia.org
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www.emedicine.com
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en.wikipedia.org
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www.nlm.nih.gov
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ghr.nlm.nih.gov
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www.emedicine.com
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pubchem.ncbi.nlm.nih.gov
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adam.about.com
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