The immunological properties of three pure enzyme proteins carrying respectively the two threonine‐sensitive aspartokinase I and homoserine dehydrogenase I activities (Aspartokinase I—homoserine dehydrogenase I), the two methionine‐repressible aspartokinase II and homoserine dehydrogenase II activities (aspartokinase II—homoserine dehydrogenase II), and the lysine‐sensitive aspartokinase III (aspartokinase III), have been investigated by means of double diffusion precipitation in agar gel. The antigenic structures of these three proteins appeared different: no cross‐reactions were detected.
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Kaminski et al. (1969) studied this question.
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