Splenic B cells were isolated from wt naïve mice in either pure B6 or non-B6 genetic background that is the same as G1XP lymphomas. B cells were purified by negative selection kit (Stem Cell Technologies, Canada), activated with anti-CD40 and IL-4 as described previously [27 (link)], and collected 4 days after culture for genomic DNA isolation which were subject to NGS. In vivo immunization and GC B cell isolation were performed as described previously [27 (link)]. The GC B cells were isolated from non-B6 genetic background that is the same as G1XP lymphomas.
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