The acetylcholinesterase tetramerisation domain is found at the C terminus and forms a left handed superhelix.

1: The synaptic acetylcholinesterase tetramer assembles around a polyproline II helix. Dvir H, Harel M, Bon S, Liu WQ, Vidal M, Garbay C, Sussman JL, Massoulie J, Silman I; EMBO J. 2004;23:4394-4405. PMID:15526038