IGHG3 and B-cell chronic lymphocytic leukemia: The regeneration of PB PC numbers here reported between MBLhi and CLL-0 could be, thereby, due to such reactivation of antibody responses against common (dominant) antigens, including new antibody responses against CMV and EBV [14]; this is consistent with the apparent recovery of the number of PB PCs (and also MBCs) expressing Ig-subclasses, which are coded upstream in the IGHC gene block (i.e., IgG3+, IgG1+, and IgA1+) as found here for CLL-0 patients.