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<p>For symbols of metabolites if the differences were greater than .0003 proportional m/z units (m/z difference divided by m/z value) then the symbol was labeled "circa" after the atomic composition. </p>
<p>For description of metabolites if the proportional difference of the m/z ratio between Evan's EPFL Polar metabolite assignments and RTI assignments was very low (<.0001 proportional m/z units) then the symbol and description was taken directly from Evan's metabolite file, but if differences were between 0.0001 and about .0003 proportional m/z units then the descriptions were labeled "Putative" . If the differences were greater than .0003 units, then the descriptions were labeled "Provisional". For example,<span style="background-color:rgb(238, 238, 238); color:rgb(34, 34, 34); font-family:verdana,geneva,lucida,lucida grande,arial,helvetica"> "P</span><span style="color:rgb(34, 34, 34); font-family:verdana,geneva,lucida,lucida grande,arial,helvetica; font-size:12px">rovisional assignment. Vanilpyruvic acid is a catecholamine metabolite and precursor to vanilactic acid. Accumulation in urine is indicative of Aromatic L-aminoacid decarboxylase deficiency (PMID 16288991)." </span></p>
<p> by Rob Williams and Arthur Centeno, Aug 25, 2014</p>
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