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Primers used for construction of probes containing a single ribose residue (probes 1–3) or a stretch of ribose residues (probe 4). Capital letters are used for deoxyribonucleotides and lowercase letters are used for ribonucleotides. A triangle (Δ) indicates the position of ribose misincorporation for probe 2 and the location of ribose residue in probe 3.
