B. Salafsky, Yu-Sheng Wang, Alan C. Fusco, Jill Antonacci, The Role of Essential Fatty Acids and Prostaglandins in Cercarial Penetration (Schistosoma mansoni), The Journal of Parasitology, Vol. 70, No. 5 (Oct., 1984), pp. 656-660
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Salafsky et al. (1984) studied this question.