Kovalev_2004_Ukr.Biokhim.Zh.(1999)_76_39

An analysis of brain cholinesterase properties in 3 species of cartilaginous fishes and 1 species of chondrostei, was conducted for the first time. The skates brain enzymes, as to substrate specificity, are shown to be referred to acetylcholinesterases, and the shark brain cholinesterase - to atypical acetylcholinesterase. Kaluga brain cholinesterase, as to its substrate specificity, differes from brain enzymes of cartilaginous fishes. The differences in properties of the nervous tissue cholinestarase of the investigated fish species are the parameters of evolutionary divergence of species.