3AJ4:
reference: Intracellular phosphatidylserine is essential for retrograde membrane traffic through endosomes., Uchida Y, Hasegawa J, Chinnapen D, Inoue T, Okazaki S, Kato R, Wakatsuki S, Misaki R, Koike M, Uchiyama Y, Iemura S, Natsume T, Kuwahara R, Nakagawa T, Nishikawa K, Mukai K, Miyoshi E, Taniguchi N, Sheff D, Lencer WI, Taguchi T, Arai H, Proc Natl Acad Sci U S A. 2011 Sep 20;108(38):15846-51. Epub 2011 Sep 12. PMID: 21911378

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