nuclear antigen and polypeptide expression occurred equally well when the epstein-barr virus dna was cloned on psv2 -gpt or psvod . the latter plasmid lacks sequences allowing for efficient early gene transcription as well as splicing and polyadenylation signals which are present in psv2 . preliminary mapping of the ebna gene transcripts demonstrated that two mrnas ( 2.9 and 2.4 kilobases [ kb ] ) are homologous to the i1f fragment .
C0069115
nuclear antigen
C0116397
ebna