Zoomed view of the 1 H- 15 N HSQC spectra showing the titration points of different peptides (P6—up, P16—middle, and SF1 WWbs —down) to PRPF40A WW12. In the middle spectrum, amide signals are labeled; sc refers to the N-H correlation of the tryptophan side chain. Full spectra in Supplementary Fig. 8 .
