title: Demonstration of the presence of cholinesterase in the brain of the tick.
mesh_terms: D000818:Animals; D001921:Brain / Q000187:drug effects / Q000201:enzymology*; D002800:Cholinesterase Inhibitors; D002802:Cholinesterases / Q000302:isolation & purification*; D010756:Phosphoric Acids / Q000494:pharmacology; D013987:Ticks / Q000201:enzymology*; D014112:Toxaphene / Q000494:pharmacology
chemical_list: D002800:Cholinesterase Inhibitors; D010756:Phosphoric Acids; D014112:Toxaphene; D002802:Cholinesterases