LNA-ISH of miRNAs miR-126, let-7b and U6 snRNA. PECAM1 (CD31) staining of endothelial cells. (A-D) Human skin including epidermis, (E-H) human lung, (I-L) coronary artery, (M-P) human brain and (Q-T) human umbilical vein. * represents the location of ECs. For LNA-ISH, positive staining is blue. For PECAM1 IHC, positive staining is brown. Original magnification 160× (A-H, M-T) or 100× (I-L).