Levels of chemokine mRNA expression in HD tissues and lymphoid hyperplasia. Total cellular RNA, extracted from paraffin-embedded tissues diagnosed with HD (▪) and lymphoid hyperplasia (□) was subjected to semiquantitative RT-PCR. After normalization to a standard RNA preparation and to G3PDH, the results of phosphorimage analysis are shown and plotted logarithmically as the geometric means (x/÷ SEM) of normalized arbitrary units (pixels)/group for each respective chemokine. SEMs were too small to be distinguished from the mean.