“…For the identification of the 13 C resonances within a residue, broadband recoupling methods are usually applied (Bennett et al, 1992), , (Carravetta et al, 2000), (Verel et al, 1998), (Verel et al, 2001), . For the sequential assignment of the amino-acid residues, two-and three-dimensional correlation experiments are applied which make use of heteronuclear transfer by cross-polarization (CP) and homonuclear transfer by broad-band (vide supra) and narrowband dipolar recoupling schemes such as rotationalresonance tickling (R 2 T) (Takegoshi et al, 1995), (Takegoshi et al, 1997), (Costa et al, 1997).…”