Multiple clones and common clones contribute to hematopoiesis in primary and secondary recipients. (A,B) Representative gel of RIS amplified by LAM-PCR in primary (1°) and secondary (2°) recipients. (C) Detection of a common integration site in different hematopoietic lineages using LTR-specific (forward) and dog genomic (reverse) primers of the primary and secondary dogs pictured in panel A. “ND” is a different dog that received lentivirus-transduced cells.