tokens: To develop a transformation system with a conditional Epstein-Barr virus nuclear antigen 2 ( EBNA2 ) gene , we fused the hormone binding domain of the oestrogen receptor to the N or C terminus of EBNA2 .
folded_tokens: to develop a transformation system with a conditional epstein-barr virus nuclear antigen 2 ( ebna2 ) gene , we fused the hormone binding domain of the oestrogen receptor to the n or c terminus of ebna2 .
labels: O O O O O O O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region B-protein_molecule O O O O O O B-protein_domain_or_region I-protein_domain_or_region I-protein_domain_or_region O O O O O O O O O O O B-protein_molecule O