S. Sepsenwol, M. Nguyen, T. Braun, Adenylate Cyclase Activity Is Absent in Inactive and Motile Sperm in the Nematode Parasite, Ascaris suum, The Journal of Parasitology, Vol. 72, No. 6 (Dec., 1986), pp. 962-964
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Sepsenwol et al. (1986) studied this question.