4R9Y:
reference: Atomic description of the immune complex involved in heparin-induced thrombocytopenia., Cai Z, Yarovoi SV, Zhu Z, Rauova L, Hayes V, Lebedeva T, Liu Q, Poncz M, Arepally G, Cines DB, Greene MI, Nat Commun. 2015 Sep 22;6:8277. doi: 10.1038/ncomms9277. PMID: 26391892

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