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Relative amino acid substrate activities as determined by using the ATP-PPi exchange assay and His-CmaA. The y axis indicates the ATP-PPi exchange activity for various amino acid substrates compared to the activity for l-allo-isoleucine. The curved line indicates that the data for l-allo-isoleucine, at a relative activity of 100%, are off the scale relative to the data for the other substrates.
