[Acetylcholinesterase activity in the nervous system of normal planaria and during regeneration]

The acetylcholine esterase (AChE) activity was studied in the nervous system of planarians in the normal state and during regeneration. During the regeneration of the cephalic body end, the AChE appears in the cells of the newly formed ganglion on the 5th day. During the regeneration of caudal body end, the AChE activity in the residual ganglion after the cut exceeds the normal level. The possible role of the ACh system in the processes of planarian regeneration is discussed.