6DCL:
reference: Structural basis for terminal loop recognition and stimulation of pri-miRNA-18a processing by hnRNP A1., Kooshapur H, Choudhury NR, Simon B, Muhlbauer M, Jussupow A, Fernandez N, Jones AN, Dallmann A, Gabel F, Camilloni C, Michlewski G, Caceres JF, Sattler M, Nat Commun. 2018 Jun 26;9(1):2479. doi: 10.1038/s41467-018-04871-9. PMID: 29946118

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