2.1.1.4 bicarbonate activation 441491 2.1.1.4 additional information citric acid cycle intermediates are good activators 441491 2.1.1.4 additional information retinoic acid stereoisomers induce an increase in activity and mRNA level 441497 2.1.1.4 N-acetylserotonin activation 441491 2.1.1.4 N-acetylserotonin inhibition 441484 2.1.1.4 oxaloacetate activation 441491 2.1.1.4 S-adenosyl-L-methionine activation 441491 2.1.1.4 S-adenosyl-L-methionine inhibition 441484 2.1.1.4 tryptamine activates by 25% 734546