3K6B:
reference: Structural characterization of the E2 domain of APL-1, a C. elegans homolog of human amyloid precursor protein, and its heparin binding site., Hoopes JT, Liu X, Xu X, Demeler B, Folta-Stogniew E, Li C, Ha Y, J Biol Chem. 2009 Nov 10. PMID: 19906646

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