5YKH:
reference: Expanding RNA binding specificity and affinity of engineered PUF domains., Zhao YY, Mao MW, Zhang WJ, Wang J, Li HT, Yang Y, Wang Z, Wu JW, Nucleic Acids Res. 2018 Feb 27. pii: 4911549. doi: 10.1093/nar/gky134. PMID: 29490074

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