Abstract
The occurrence and distribution of 4-aminobutyrate:2-oxoglutarate transaminase (GABA-T) activity were examined in the guinea pig lung using biochemical and enzymehistochemical methods. Specific GABA-T reactivity was confined primarily to the arteries and to a lesser extent to the veins. No activity could be observed in association with bronchi, alveoli and nerve fibers. Our findings indicate that the GABA-T activity in the lung is specifically located in blood vessels. This study is the first to demonstrate GABA-T activity in peripheral blood vessels.
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