. "Catalysis of the reaction: L-glutamate = 4-aminobutanoate + CO2." . . "glutamate decarboxylase activity" . "aspartic alpha-decarboxylase" . "cysteic acid decarboxylase activity" . "gamma-glutamate decarboxylase activity" . "L-aspartate-alpha-decarboxylase activity" . "L-glutamate 1-carboxy-lyase (4-aminobutanoate-forming)" . "L-glutamate 1-carboxy-lyase activity" . "L-glutamate alpha-decarboxylase activity" . "L-glutamic acid decarboxylase activity" . "L-glutamic decarboxylase activity" . . .