The European DNA database was searched for 7–8 consecutive complementary sequences starting 2 bp from the 5’ or 3’ end of miR-31, miR-184, and miR-150. Complementary regions were identified in the 3’UTR of: Pdgfb, Hif1α, and Frizzled4 for miR-31; Vegf, Pdgfb, Pdgfa, and Notch4 for miR-150, and Frizzled 4 for miR-184 (A). Areas of alignment with the 3’UTR of Vegf, Pdfgb, Hif1a and Notch4, but not Frizzled4 were highly conserved among different species.