“This thesis is supported by the fact that (a) Mn(II) and Zn(II) inhibit inactivation and also interfere with the reduction of … H2O2 (anaerobically), in the absence of a P-450 system, catalyze glutamine synthetase inactivation; (c) inactivation is inhibited by catalase; and (d) hexobarbital , which … of glutamine ….”