Morphology of SUDHL4 and PC-3 cells after exposure to flavopiridol. (A) Untreated control SUDHL4s. (B) SUDHL4s after 12 hours exposure to flavopiridol at 1,000 nmol/L. (C) Untreated control PC-3s. (D) PC-3s after 12 hours exposure to flavopiridol at 1,000 nmol/L. Photography was at 1,000 ×, oil immersion microscope, after cytospin preparation as described in Materials and Methods.