Human glial cells grown in culture and gliomas and white matter contain an l-glutamic acid decarboxylase which is stimulated markedly by carbonyl-trapping agents. In contrast, L-glutamic acid decarboxylase activity of human cerebral gray matter is strongly inhibited by carbonyl-trapping agents. These results suggest a glial localization of the new type of l-glutamic acid decarboxylase.
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Haber et al. (1970) studied this question.
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