4ARD:
reference: Structure of the immature retroviral capsid at 8 A resolution by cryo-electron microscopy., Bharat TA, Davey NE, Ulbrich P, Riches JD, de Marco A, Rumlova M, Sachse C, Ruml T, Briggs JA, Nature. 2012 Jul 19;487(7407):385-9. PMID: 22722831

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