Comparison of microRNA expression measurements by microarray and RT-PCR. A) A heat map comparing the average fold-changes in microRNAs with significantly higher (red) or lower (green) expression in LNCaP cells in comparison to PC3 cells as determined either by Taqman® qRT-PCR or microarray analysis (unamplified and amplified). Genes included in the figure are those found to be significantly different by one or both methods. Mir-130b and miR-301 were not found to be significantly different in amplified samples by SAM analysis. B) Pearson correlation scatter plots of comparisons of array data to qRT-PCR for amplified and unamplified miRNA.