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. 2012 Dec 7;7(12):e50019. doi: 10.1371/journal.pone.0050019

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© 2012 Johnson et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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(A). Ultraviolet absorption spectrum of DNA in the presence of 10 mM Mg²⁺. (B). Changes in the methylxanthines (theophylline, theobromine and caffeine) bound (P/D 6) DNA spectra in the presence of 10 mM Mg²⁺.