5WY3:
reference: Molecular architecture of the 90S small subunit pre-ribosome., Sun Q, Zhu X, Qi J, An W, Lan P, Tan D, Chen R, Wang B, Zheng S, Zhang C, Chen X, Zhang W, Chen J, Dong MQ, Ye K, Elife. 2017 Feb 28;6. pii: e22086. doi: 10.7554/eLife.22086. PMID: 28244370

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