Presence of HCMV DNA in the progeny derived from HCMV-infected CD34⁺ BM cells. (A) Ethidium bromide-stained 1% agarose gel of PCR for HCMV DNA in suspension cultures derived from HCMV-infected CD34⁺ cells 28 days postinfection. (B) Ethidium bromide-stained 1% agarose gel of PCR for HCMV DNA in colonies derived from infected CD34⁺ cells 14 days postinfection. The arrows indicate the IE PCR product of 332 bp. Lane 1, DNA from the cultures infected with 95(2); lane 2, DNA from the cultures infected with Towne/lox²; lane 3, DNA from the mock-infected cultures; lane m, 100-bp ladder (GIBCO/BRL).