The structures of aptamers, DNA and RNA constructs, and nucleotides are shown. Indicated compounds used in this study are¹  (A-E) chemically synthesized by a commercial supplier (PURIMEX, Grebenstein, Germany),²  (A) enzymatically transcribed in vitro from oligonucleotide templates using T7 RNA polymerase,³  (B and C) chemically synthesized in house using the phosphoramidite method (Gene Assembler Special, Pharmacia Biotech, Freiburg, Germany),⁴  (F) isolated from mouse vascular smooth muscle cells using an extraction kit (Sigma, Munich, Germany) or the DNAzol reagent (Invitrogen, Groningen, The Netherlands),⁵  or (F) purchased from Fermentas (St. Leon-Rot, Germany).