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Recombinant human TNFα (rhTNFα) has previously been shown to reduce fecundity in Schistosoma mansoni adult females maintained in vitro without males, and adversely affect the uptake of [14C]-tyrosine, an amino acid required for schistosome vitellogenesis. Here we report on the effect of rhTNFα on [14C]-methionine uptake in both separated and paired females, and the effect of three different preparations...