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Alr but not IlvA is sensitive to 3-chloroalanine (3CA).A and B, proteins Alr (A) Alr and IlvA (B) were purified from a wildtype (ridA+). Proteins were incubated with (red) or without (blue) 3CA, as described in the text. Cofactors were released with base treatment and separated on HPLC.
