temperature-sensitive mutations of the choline acetyltransferase ( cha ) gene , which lead to reduced choline acetyltransferase ( chat ) activity and acetylcholine ( ach ) levels , have been used in an attempt to identify the neurotransmitter at a chemical synapse in the giant fiber pathway ( gfp ) of drosophila melanogaster .
C0001068
acetyltransferase
C0008407
chat