Effect of As and As/IFN on gene expression in activated PBMCs. Microarray analysis of the gene expression profile of activated PBMCs in response to treatment with As and combined As/IFN treatment for 48 hours as compared to control (ctr). (A) IFN-responsive genes. (B) Genes induced by As. (C) Genes repressed by As (for details, see “Materials and methods”).