Trypanosoma cruzi 6 cruzipain 6 cystatin cysteine proteinase 6 enzyme purification 6 Cysteine Endopeptidases 4 article 4 enzyme analysis 4 enzyme structure 4 enzyme substrate 4 kininogen 4 nonhuman 4 priority journal 4 proteinase inhibitor 4 unclassified drug 4 1,10 phenanthroline 2 2,3,5,6 tetrafluorophenoxymethyl ketone 2 Animal 2 Animals 2 Antigens, Protozoan 2 Bovinae 2 Chagas Disease 2 Chagas disease 2 Chickens 2 Comparative Study 2 CpG oligodeoxynucleotide 2 Cruzipain 2 Cystatin 2 Cystatins 2 Cysteine Proteinase Inhibitors 2