Proviral and control signals amplified from blood (PB) or marrow (BM) of two dogs transplanted with histocompatible, allogeneic, cytokine-primed marrow. Bands not at the specific sizes marked were considered artifacts and excluded from quantitation analysis. (A) Dogs receiving combined bone marrow aliquots, one transduced with HGMDR and one transduced with MGNEO. The two left lanes show signals from the HGMDR (H) and MGNEO (M) retroviral producer cell lines. (B) Dogs receiving marrow transduced with HGMDR only. The two left lanes show PCR amplification from donor bone marrow cells pretransduction and posttransduction.