Files in this Data Supplement:

• Supplemental file 1 - Supplemental text; Fig. S1 (Diagrams of the immunoglobulin μ locus in C57BL/6 and two different Sμ deletion mice), S2 (Stem-loop structure of the loxP site in the middle of the R-loop at the Iμ-Cμ region in the ΔSμTR mouse), S3 (DNA methylation analysis of the lox P sequence in the middle of the Iμ-Cμ region of the ΔSμTR allele), and S4 (Two mechanisms by which endogenous RNase H activity could generate single-stranded regions on the bottom DNA strand in or around the switch regions); and Table S1 (Molecules can have different lengths of single strandedness in the core Sμ region)
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