Endothelial, epithelial and hematologic cell comparisons. (A) Cluster analysis of endothelial, epithelial and hematologic cells from the same miRNA expression platform based on LIMMA analysis. (B) Venn diagram indicating the complete unique and shared expression patterns of miRNAs between endothelial, epithelial and heamtologic cell types. (C) Representative heat maps from 6 areas of the Venn diagram identifying specific miRNAs in different colored areas. A complete distribution of all miRNA expression is found in the Additional file 4, Table S2. (D) RT-PCR validation of variable expression between cell lines for miRNAs miR-126, miR-141 and miR-142-3p. The left image is a histogram of the frequency of expression from the GEO data set. Epithelial cell lines are red, ECs are blue and hematologic lines are black. The right image is RT-PCR data of the same miRNAs normalized to U6 snRNA.