T-helper-cell determinants in protein antigens are preferentially located in cysteine-rich antigen segments resistant to proteolytic cleavage by cathepsin B , L , and D .
t-helper-cell determinants in protein antigens are preferentially located in cysteine-rich antigen segments resistant to proteolytic cleavage by cathepsin b , l , and d .
B-protein_domain_or_region I-protein_domain_or_region O B-protein_family_or_group I-protein_family_or_group O O O O B-protein_domain_or_region I-protein_domain_or_region I-protein_domain_or_region O O B-other_name I-other_name O O O O O O O O O