Irrespective of the human cell partner used for fusion , a certain number of hybrids lost CD5 surface expression over a period of time in culture .
irrespective of the human cell partner used for fusion , a certain number of hybrids lost cd5 surface expression over a period of time in culture .
O O O B-other_name I-other_name I-other_name O O O O O O O O B-cell_line O B-protein_molecule O O O O O O O O O O