[i] We used only those tissues for which we obtained information on the most abundant microRNAs and had more than five repressed genes on both microarray platforms (seven tissues). For five of these tissues, we found a significant overrepresentation of repressed genes within the set of predicted target genes for the most abundant microRNAs. The P-value was calculated with the hypergeometric test. MicroRNA specificity information was obtained via http://www.microrna.org or literature, as specified in the last column.