Changes in the levels of antiapoptotic BCL-2 family transcripts after ABT-737 treatment. Changes in mRNA expression levels of antiapoptotic Bcl-2 family proteins after treatment with ABT-737 (50nM) for 18 hours. Expression was determined by quantitative RT-PCR to compare fold difference in expression with levels before treatment that were normalized to those found in lymphocytes isolated from 6 healthy donors. Fold change for: (A) BCL-2, (B) MCL-1, (C) BFL-1, (D) BCL-B, (E) BCL-W, and (F) BCL-XL levels. P values are shown.