For experiments male B6.SJL-Ptprcapepcb/BoyJ mice (CD45.1+/+) 8–12 weeks of age were purchased from The Jackson Laboratory (Bar Harbor, ME). CD45.2+ B cells from male or female 09–1B12-UCA KI mice (H09–1B12-UCA/WT, κ09−1B12-UCA/WT) were enriched using the Pan B Cell Isolation Kit II (Miltenyi Biotec), counted, diluted to desired cell numbers in PBS and adoptively transferred into CD45.1+ recipient mice as reported previously43 (link). Ages of the recipient animals ranged from 8–10 weeks.
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