1: Hansen DF, Neudecker P, Vallurupalli P, Mulder FA, Kay LE. Determination of
Leu side-chain conformations in excited protein states by NMR relaxation
dispersion. J Am Chem Soc. 2010 Jan 13;132(1):42-3. PubMed PMID: 20000605.

2: Hansen DF, Vallurupalli P, Kay LE. Measurement of methyl group motional
parameters of invisible, excited protein states by NMR spectroscopy. J Am Chem
Soc. 2009 Sep 9;131(35):12745-54. PubMed PMID: 19685870.

3: Vallurupalli P, Hansen DF, Lundström P, Kay LE. CPMG relaxation dispersion NMR
experiments measuring glycine 1H alpha and 13C alpha chemical shifts in the
'invisible' excited states of proteins. J Biomol NMR. 2009 Sep;45(1-2):45-55.
Epub 2009 Mar 25. PubMed PMID: 19319480.

4: Baldwin AJ, Hansen DF, Vallurupalli P, Kay LE. Measurement of methyl axis
orientations in invisible, excited states of proteins by relaxation dispersion
NMR spectroscopy. J Am Chem Soc. 2009 Aug 26;131(33):11939-48. PubMed PMID:
19627152.

5: Lundström P, Hansen DF, Vallurupalli P, Kay LE. Accurate measurement of alpha 
proton chemical shifts of excited protein states by relaxation dispersion NMR
spectroscopy. J Am Chem Soc. 2009 Feb 11;131(5):1915-26. PubMed PMID: 19152327.

6: Lundström P, Vallurupalli P, Hansen DF, Kay LE. Isotope labeling methods for
studies of excited protein states by relaxation dispersion NMR spectroscopy. Nat 
Protoc. 2009;4(11):1641-8. Epub 2009 Oct 22. PubMed PMID: 19876024.

7: Vallurupalli P, Hansen DF, Kay LE. Structures of invisible, excited protein
states by relaxation dispersion NMR spectroscopy. Proc Natl Acad Sci U S A. 2008 
Aug 19;105(33):11766-71. Epub 2008 Aug 13. PubMed PMID: 18701719; PubMed Central 
PMCID: PMC2575287.

8: Hansen DF, Vallurupalli P, Kay LE. Quantifying two-bond 1HN-13CO and one-bond 
1H(alpha)-13C(alpha) dipolar couplings of invisible protein states by spin-state 
selective relaxation dispersion NMR spectroscopy. J Am Chem Soc. 2008 Jul
2;130(26):8397-405. Epub 2008 Jun 3. PubMed PMID: 18528998.

9: Hansen DF, Vallurupalli P, Kay LE. Using relaxation dispersion NMR
spectroscopy to determine structures of excited, invisible protein states. J
Biomol NMR. 2008 Jul;41(3):113-20. Epub 2008 Jun 24. PubMed PMID: 18574698.

10: Hansen DF, Vallurupalli P, Kay LE. An improved 15N relaxation dispersion
experiment for the measurement of millisecond time-scale dynamics in proteins. J 
Phys Chem B. 2008 May 15;112(19):5898-904. Epub 2007 Nov 15. PubMed PMID:
18001083.

11: Vallurupalli P, Hansen DF, Kay LE. Probing structure in invisible protein
states with anisotropic NMR chemical shifts. J Am Chem Soc. 2008 Mar
5;130(9):2734-5. Epub 2008 Feb 8. PubMed PMID: 18257570.

12: Hansen DF, Vallurupalli P, Lundström P, Neudecker P, Kay LE. Probing chemical
shifts of invisible states of proteins with relaxation dispersion NMR
spectroscopy: how well can we do? J Am Chem Soc. 2008 Feb 27;130(8):2667-75. Epub
2008 Feb 1. PubMed PMID: 18237174.

13: Vallurupalli P, Hansen DF, Stollar E, Meirovitch E, Kay LE. Measurement of
bond vector orientations in invisible excited states of proteins. Proc Natl Acad 
Sci U S A. 2007 Nov 20;104(47):18473-7. Epub 2007 Nov 15. PubMed PMID: 18006656; 
PubMed Central PMCID: PMC2141801.

14: Lundström P, Vallurupalli P, Religa TL, Dahlquist FW, Kay LE. A
single-quantum methyl 13C-relaxation dispersion experiment with improved
sensitivity. J Biomol NMR. 2007 May;38(1):79-88. Epub 2007 Apr 27. PubMed PMID:
17464570.

15: Vallurupalli P, Scott L, Williamson JR, Kay LE. Strong coupling effects
during X-pulse CPMG experiments recorded on heteronuclear ABX spin systems:
artifacts and a simple solution. J Biomol NMR. 2007 May;38(1):41-6. Epub 2007 Mar
3. PubMed PMID: 17334825.