| 4DDJ: reference: Structure of saposin A lipoprotein discs., Popovic K, Holyoake J, Pomes R, Prive GG, Proc Natl Acad Sci U S A. 2012 Feb 21;109(8):2908-12. Epub 2012 Feb 2. PMID: 22308394 |
This OCA 
Structure page
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(documentation).