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Deficiencies of the Msh2 protein or the Sμ tandem repeat (SμTR) sequences each reduce isotype switching in mice by about 2- to 3-fold. We find that switching in mice deficient for both Msh2 and SμTR is nearly ablated. We propose that the SμTR provides closely spaced cleavage sites that can undergo switch recombination independent of Msh2, whereas cleavages in sequences flanking the SμTR require Msh2...
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