2UP1:
reference: Crystal structure of the two-RRM domain of hnRNP A1 (UP1) complexed with single-stranded telomeric DNA., Ding J, Hayashi MK, Zhang Y, Manche L, Krainer AR, Xu RM, Genes Dev 1999 May 1;13(9):1102-15. PMID: 10323862

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