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3.6.1.31	210041	The product of the his4 gene cluster in Saccharomyces cerevisiae. A trifunctional polypeptide	J. Biol. Chem.	254	7427-7433	1979	Saccharomyces cerevisiae	http://www.ncbi.nlm.nih.gov/htbin-post/Entrez/query?uid=379004&form=6&db=m