Measurement of Methyl Axis Orientations in Invisible, Excited States of Proteins by Relaxation Dispersion NMR SpectroscopyAndrew J. Baldwin, D. Flemming Hansen, Pramodh Vallurupalli and Lewis E. Kay*AbstractFew detailed studies of transiently populated conformations of biological molecules have emerged despite the fact that such states are often important to processes such as protein folding, enzy