because these situations are accompanied by changes in the cortical cholinergic system ( including an increase and decrease in levels of the g4 form of acetylcholinesterase , respectively ) , it is concluded that , at least in the human neocortex , bche is unrelated to cholinergic neurotransmission associated with subcortical cholinergic projection fibres .
C0001044
acetylcholinesterase
C0008429
bche