3OBS:
reference: Crystallographic and functional analysis of the ESCRT-I /HIV-1 Gag PTAP interaction., Im YJ, Kuo L, Ren X, Burgos PV, Zhao XZ, Liu F, Burke TR Jr, Bonifacino JS, Freed EO, Hurley JH, Structure. 2010 Nov 10;18(11):1536-47. PMID: 21070952

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