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(A) Secondary structure of SL1 with color-coded SHAPE reactivities mapped to each nucleotide. Reactivities are normalized based on the RNAStructure software (Mathews et al, 2004). No data could be acquired for nucleotides represented in grey. (B) Refined SAXS envelope for SL1 generated by ATSAS (Svergun et al, 1999; Volkov et al, 2003).
