Comparative effect of procyanidins B2-3G, B2-3’G and B2-G2 on the growth and viability of human prostate carcinoma LNCaP cells in vitro. LNCaP cells were cultured in 60 mm culture plates for 36 h and were then treated with 0–50 µM concentrations of B2-3G (A), B2-3’G (B) and B2-G2 (C) in DMSO or DMSO alone for 12 h. At the end of treatment times, cell viability was measured by Trypan blue dye exclusion assay as described under Materials and Methods section. Data indicate mean ± SD, n=3. *, P<0.05; $, P<0.001 compared with control.