Protozoa nonhuman article 110 Trypanosoma cruzi 98 priority journal 98 Animals 78 Trypanosoma 78 controlled study 46 Molecular Sequence Data 42 Amino Acid Sequence 30 protozoon 30 Animalia 28 trypanosoma cruzi 28 Mammalia 26 Protozoan Proteins 26 Base Sequence 24 Chagas disease 24 enzyme activity 24 unclassified drug 24 Humans 22 animal cell 22 nucleotide sequence 22 Eukaryota 20 Animal 18 Cloning, Molecular 18 Support, Non-U.S. Gov't 18 amino acid sequence 18 epimastigote 18 Trypanosomatidae 16 human 16