Ad5/mT: Recombinant adenovirus in which the E1A, E1B early region of the virus has been replaced with the coding region for polyomavirus middle T antigen. The virus can only replicate and produce viable virus particles in 293 cells which provide the missing E1A and E1B proteins.
Ad5/GP: Recombinant adenovirus in which the E1A and E1B early region has been replaced by sequences coding for the Rabies virus Gp protein. It will only replicate and produce virus in 293 cells.