This family of proteins are distantly related to sulfotransferase enzymes. This protein in S. mansonii [1] has been shown to be involved in resistance to oxamniquine and to have sulfotransferase activity.

1: Genetic and molecular basis of drug resistance and species-specific drug action in schistosome parasites. Valentim CL, Cioli D, Chevalier FD, Cao X, Taylor AB, Holloway SP, Pica-Mattoccia L, Guidi A, Basso A, Tsai IJ, Berriman M, Carvalho-Queiroz C, Almeida M, Aguilar H, Frantz DE, Hart PJ, LoVerde PT, Anderson TJ; Science. 2013;342:1385-1389. PMID:24263136