tokens: Cells expressing the E1A oncoprotein were selectively killed by unstimulated NK cells , while the same parental cells but expressing the HPV type 16 ( HPV-16 ) or HPV-18 E7 oncoprotein were resistant to NK cell lysis .
folded_tokens: cells expressing the e1a oncoprotein were selectively killed by unstimulated nk cells , while the same parental cells but expressing the hpv type 16 ( hpv-16 ) or hpv-18 e7 oncoprotein were resistant to nk cell lysis .
labels: O O O B-protein_molecule O O O O O B-cell_line I-cell_line I-cell_line O O O O B-cell_type I-cell_type O O O B-virus O O O B-virus O O B-virus B-protein_molecule O O O O B-other_name I-other_name I-other_name O