Endothelial cell miRNA clustering. (A) Hierarchical clustering based on LIMMA pairwise differential analysis of 59 miRNAs that had an unadjusted p value < 0.05. (B) Hierarchical cluster based on the SAM significant miRNAs let-7b, miR-20b and miR-99b. (C) Heat map demonstrating similar expression patterns across miRNAs within the same chromosomal cluster. Light blue represents low expression, dark blue represents high expression.