Files in this Data Supplement:

• Supplemental file 1 - Supplemental text and Fig. S1 (Two models for the formation of long R-loops), S2 (Schematic of RNase T1 interference with R-loop formation), S3 (Decrease in R-loop formation efficiency as a function of the number of switch repeats), and S4 (Decrease in R-loop formation efficiency with the decrease in G-clustering within switch repeats)
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