PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 27830476-2 2017 The first barrier to successful xenotransplantation is hyperacute rejection, a rapid, massive humoral immune response directed against the pig carbohydrate GGTA1 epitope. Carbohydrates 143-155 N-acetyllactosaminide alpha-1,3-galactosyltransferase Sus scrofa 156-161