Whole blood was collected from six healthy Caucasian donors by Research Blood Components LLC (Brighton, MA) with IRB consent between 2009 and 2010. B-Cell isolation and LCL generation were performed at the University of Chicago as described previously [14 (link)]. Between February 2011 and October 2012, each line was thawed, cultured, and re-frozen every three months, for a total of six freeze-thaw cycles prior to use in our study [16 (link)]. LCLs were cultured in RPMI with 20% FBS and frozen in Recovery Cell Culture Freezing Media (Life Technologies).
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