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Somatic extracts and excretory/secretory (ES) products of the adult stage of Dictyocaulus viviparus were examined for acetylcholinesterase (AChE) activity. Both were found to contain activity which had an optimum pH of 9.5, however, the adult ES products contained over 200 times more AChE activity...

McKeand, J. B.; Knox, D. P.; Duncan, J. L.; Kennedy, M. W.
International Journal for Parasitology, 1994, 24, 4, pp 501-510