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gamma-Glutamylcysteine synthetase (rat kidney; Mr approximately 104,000) is composed of 2 nonidentical subunits. In the present work, a procedure was developed for the reversible dissociation of the enzyme into its subunits (Mr = 73,000 and 27,700) under nondenaturing conditions. Students in which gel electrophoresis was used, in conjunction with an enzyme activity stain and elution and re-electrophoresis of protein bands, showed that the heavy subunit contains all of the structuralpmid:6146611 fatcat:kka2rs2xwzet5f7zykbzncw2ee