Abstract
We have previously reported that a segment of DNA from a murine plasmacytoma comprises DNA from three chromosomes, the immunoglobulin kappa light-chain locus on chromosome 6, the Sμ locus on chromosome 12, and a region on chromosome 15. We now report that the reciprocal product contains DNA from only the kappa locus and chromosome 15 and not from Sμ. We conclude that a complex series of events, including both a transposition of DNA and a translocation between chromosomes, generated these imperfect reciprocal products.