OAS (A, B), CXCL9 (C, D) and CXCL10 (E, F) expression during chronic SIV infection at lymph node are shown from Rhesus macaques orally inoculated with low (A, C, E) or high doses (B, D, F) of SIVmac251. Each bar represents the fold change of gene expression at one time point compared to uninfected macaques. The shaded area across the x-axis represents two standard deviations of the average expression of the corresponding gene in uninfected macaques.