Sensitivity of the RT-PCR assay for the chimeric transcripts. (A) The sensitivity for Iμ-BCL6E2 with DLBCL cells. The RNA equivalent for the indicated DLBCL-cell number was diluted into RNA from 1 × 10⁶ DG75 cells for the assay done in duplicate. (B) The assay sensitivity for tonsillar cells. The tonsillar cells were serially diluted as indicated; the highest dilution (eg, lowest cell number) with a positive Iμ-BCL6E2 signal from at least one sample of the duplicates is scored as the end dilution.