Further optimization of culture conditions , type of Antigen Presenting Cells ( APC ) , peptides , use of stabilizers like beta 2-m are still needed .
further optimization of culture conditions , type of antigen presenting cells ( apc ) , peptides , use of stabilizers like beta 2-m are still needed .
O O O O O O O O B-cell_type I-cell_type I-cell_type O B-cell_type O O B-peptide O O O O O B-protein_molecule I-protein_molecule O O O O