Characterization of the Iμ-BCL6 transcript producing cells from normal lymphoid tissues and PBMCs. Chimeric Iμ-BCL6 transcripts detected from the representative tonsil (A), spleen (B), and PBMC (C) donors are shown. Associations of the chimeric Iμ-BCL6 transcripts with the tonsillar B-cell subpopulations positively selected by magnetic beads (D) and sorted by FACS (E) are presented.