Amalfitano A, Chamberlain JS. Isolation and characterization of packaging cell lines that coexpre ss the adenovirus E1, DNA polymerase, and preterminal proteins: implications for gene therapy. Gene Ther. 1997;4(3):258 -63. 58. Hartigan -O'Connor D, Amalfitano A, Chamberlain JS. Improved production of gutted adenovirus in cells expressing adenovirus prete rminal protein and DNA polymerase. J Virol.