tokens: In contrast , APC pulsed with Ala -substituted peptides 430-444 , 442A or 433-442A at neutral pH failed to stimulate the T cell clone , while APC pulsed at acidic pH and subsequently washed led to successful T cell activation .
folded_tokens: in contrast , apc pulsed with ala -substituted peptides 430-444 , 442a or 433-442a at neutral ph failed to stimulate the t cell clone , while apc pulsed at acidic ph and subsequently washed led to successful t cell activation .
labels: O O O B-cell_type O O B-amino_acid_monomer O O B-peptide O B-peptide O B-peptide O B-other_name I-other_name O O O O B-cell_line I-cell_line I-cell_line O O B-cell_type O O B-other_name I-other_name O O O O O O B-other_name I-other_name I-other_name O