6DHW:
reference: Functional and structural similarity of human DNA primase [4Fe4S] cluster domain constructs., Holt ME, Salay LE, O'Brien E, Barton JK, Chazin WJ, PLoS One. 2018 Dec 18;13(12):e0209345. doi: 10.1371/journal.pone.0209345., eCollection 2018. PMID: 30562384

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