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argininosuccinate synthase argG in bacteria, ARG1 in Saccharomyces cerevisiae. There is a very unusual clustering in the alignment, with a deep split between one cohort of E. coli, H. influenzae, and Streptomyces, and the other cohort of eukaryotes, archaea, and the rest of the eubacteria. [Amino acid biosynthesis, Glutamate family]
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