Recombinant Epstein-Barr virus Trans-activator protein BZLF1 (BZLF1) is a purified Recombinant Protein. Purity: >85% as determined b y SDS-PAGE. Host: E. coli. Endotoxin Level: Not Tested. Species: Epstein-Barr virus (strain GD1) (HHV-4) (Human herpe 1 * 100 µG