A structural model of the 22k fragment of apolipoprotein E4 based on data from Dong J, Peters-Libeu CA, Weisgraber KH, Segelke BW, Rupp B, Capila I, Hernaiz MJ, LeBrun LA, and Linhardt RJ (2001). Interaction of the N-terminal domain of apolipoprotein E4 with heparin. Biochemistry. 40: 2826-2834. DOI: 10.1021/bi002417n. Data accessed from the protein data bank at https://www.rcsb.org/structure/1B68 and modeled using PyMOL.