FL transcripts are expressed by human leukemia/lymphoma-derived cell lines and primary AML blasts. Total cellular RNA was extracted from cell lines and patients' blast cells. RNA (50 ng-100 ng) was reverse transcribed and amplified using primer pairs for FL and actin. PCR products were resolved on 2.5% agarose gel in the presence of ethidium bromide, and photographs were taken under UV transillumination. (A) Leukemia/lymphoma cell lines. (B) Primary AML blast samples.