PCR amplification of DNA from clinical-grade DC (A and B), from corresponding AC (C), and from CD34⁺ cells (D) from MM patients. (A) Ethidium bromide-stained agarose gel of the 233-bp amplification products. Lane M was a molecular size marker. (B, C, and D) Specific hybridization of the PCR products to a³²P-end-labeled internal probe after transfer to a nylon membrane. The positive control (lane C) was the PCR product from the BCBL-1 cell line.