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Recently, a quantitative J correlation technique has been presented which makes use of homonuclear Hartmann–Hahn cross-polarization (TOCSY) to measure 3JC′C′ in proteins isotopically enriched with 13C [Grzesiek, S. and Bax, A. (1997) J. Biomol. NMR, 9, 207–211]. Since homonuclear Hartmann–Hahn is twice as fast as conventional COSY transfer, this method is much less sensitive to transverse relaxation,...
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