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Mice selectively bred for differences in open-field activity were utilized to test the hypothesis that differences in open-field behaviour are mediated at least in part by components of the GABA system, including brain glutamic acid decarboxylase activity (V, Vmax, and Km), as well as glutamate and GABA concentrations. Enzyme velocity was found to be inversely correlated with open-field activity, but it accounted for less than 15% of the variance. Moreover, the rank order of the lines was not as predicted for a genetically correlated character and the magnitude of the differences in enzyme activity among the lines was not large. It was therefore concluded that the GABA system is not an important mediator of differences in open-field behaviour in these lines of mice.
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