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(A) Secondary structure of SL UCUUU. (B) Superposition of 1H-15N HSQC of PTB RRM1 in SL UCUUU RNA free and bound states acquired at 40°C (blue and red respectively). Boxed regions have lower contour thresholds. Selected amide shift changes from residues at the RRM-α3 interface are indicated in bold. (C) Amide chemical shift perturbation mapping of PTB RRM1 upon binding SL UCUUU.
