Abstract
A number of moderately reiterated murine genetic elements have been shown to have structures like those of retroviral proviruses. These elements are thought to be transposons, although little evidence of their transposability exists. Two members of one of these families of reiterated elements, the ETn family, have inserted into separate immunoglobulin heavy-chain switch regions in the plasmacytoma P3.26Bu4. Switch regions are those DNA segments associated with each immunoglobulin heavy-chain gene in which the somatic recombinations that accompany the heavy-chain switch occur. This role in somatic recombination may be relevant to the ETn insertions into the switch regions in P3.26Bu4 DNA. P3.26Bu4 and a number of other B-lineage cells contain ETn transcripts.
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