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GEORGE MINASOV, AND MARTIN EGLI*Several readers were unsure whether the DNA in these studies contained a fluorinated residue.Indeed, the studies reported in our previous papers employed a DNA that contained a single 2′-deoxy-2′-fluoroarabino-thymidine instead of residue T7.This was explicitly mentioned in the originally submitted and refereed manuscript: "The DDD used in the present study contains a 2′-deoxy-2′-fluoroarabino-thymidine instead of residue T7 and was purchased from Oligos Etc., Wilsonville, OR (for details see reference 12 [Berger, I.; Tereshko, V.;