J. R. Ingram, S. B. Rafi, L. Lambeth, I. Hsieh, D. Ruelas, K.C. Lim, J. Sakanari, C. S. Craik, M. P. Jacobson and J. H. McKerrow.  “Investigation of the proteolytic functions of an expanded cercarial elastase gene family in Schistosoma mansoni“, PLoS Neglected Tropical Diseases, 6 (2012) e1589.   PMC3317910  F1000