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(A) 13C HSQC spectra of UCUCU (S3) bound to PTB34 H134A (red). (B) 13C HSQC spectra of UCUCU (S4) bound to PTB34 H134A. In S4, only the uridines are 13C-labeled. The assignment is indicated and in spectrum (A), a cross indicates the position of the cross-peaks from cytidine resonances.
