The effective activation of the EPH kinase domain requires oligomerisation of EPH receptors and ephrins (EFNs) (Davis et al. 1994). Tetrameric EPH:EFN complexes aggregate into higher-ordered EPH:EFN clusters through several low-affinity EPH:EPH and EFN:EFN interactions, which may be responsible for EPH:EFN signaling (Stein et al. 1998, Pabbisetty et al. 2007).
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