Gary L. Uglem, Sidney M. Beck, Habitat Specificity and Correlated Aminopeptidase Activity in the Acanthocephalans Neoechinorhynchus cristatus and N. crassus, The Journal of Parasitology, Vol. 58, No. 5 (Oct., 1972), pp. 911-920
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Uglem et al. (1972) studied this question.
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