parasite antigen nonhuman 32 Trypanosoma cruzi 28 article 28 priority journal 22 Animals 18 controlled study 18 Antigens, Protozoan 16 animal 16 human 16 unclassified drug 16 Animal 14 Chagas Disease 14 Support, Non-U.S. Gov't 14 trypanosoma cruzi 14 Humans 12 immunology 12 Antibodies, Protozoan 10 Chagas disease 10 Cysteine Endopeptidases 10 cruzipain 10 cysteine proteinase 10 metabolism 10 mouse 10 animal cell 8 chagas disease 8 chemistry 8 female 8 host parasite interaction 8 protein expression 8