2AHX:
reference: The extracellular region of ErbB4 adopts a tethered conformation in the absence of ligand., Bouyain S, Longo PA, Li S, Ferguson KM, Leahy DJ, Proc Natl Acad Sci U S A 2005 Oct 18;102(42):15024-9. Epub 2005 Oct 3. PMID: 16203964

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