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. 2008 Oct 16;36(20):6548–6557. doi: 10.1093/nar/gkn703

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© 2008 The Author(s)

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 7. — Analysis of the pKa of (filled squares) cytidine in comparison to that of (filled triangles) 5-formylcytidine. UV spectra were collected for the two nucleosides over a range of pH values, pH 2.2–7.0 for cytidine, and a pH 1.1–5.0 for f⁵C. The absorbance at 280 nm was normalized and plotted against the pH.