The transgene contains (from 5' to 3') an ampicillin resistance cassette, a replication origin, a minimal human cytomegalovirus promoter/enhancer sequence, some HIV-1 lentiviral sequences (R region, truncated 5' LTR [U5], psi [packaging signal], reverse response element, central polypurine tract and central termination sequence, a 3.7 kbp human surfactant associated protein C promoter sequence, a Herpes simplex thymidine kinase 1 mutant SR39TK sequence and additional HIV-1 lentiviral sequences (3' LTR, R region, truncated 5' LTR [U5]). (J:277115)