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. 2010 Jun 29;38(16):e162. doi: 10.1093/nar/gkq578

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© The Author(s) 2010. Published by Oxford University Press.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.5), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 2. — Representative mass spectra of the [M−2H]²⁻ ion from AU[s⁴U]AGp illustrating the limits for the dynamic range of isotope labeling. (A) Sample prepared at 5:1 ¹⁶O:¹⁸O labeling ratio. (B) Sample prepared at 1:10 ¹⁶O:¹⁸O labeling ratio.