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Irina Dudanova, Rüdiger Klein  Neuron 

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1 The Axon's Balancing Act: cis- and trans-Interactions between Ephs and Ephrins 
Irina Dudanova, Rüdiger Klein  Neuron  Volume 71, Issue 1, Pages 1-3 (July 2011) DOI: /j.neuron Copyright © 2011 Elsevier Inc. Terms and Conditions

2 Figure 1 Different Modes of Ephrin/Eph Binding in Motor Neurons
In LMCM axons (left), ephrin-As are abundant and ephrin-As and EphAs colocalize within the same membrane patches and engage in a cis-interaction, leading to inhibition of EphA forward signaling. It remains unclear why ephrins do not respond to Eph receptors presented in trans. In LMCL axons (right), ephrin-As are expressed in lower amounts, segregate from EphAs on the membrane, and bind to EphAs in trans. This results in parallel Eph forward and ephrin reverse signaling within the same growth cone, mediating repulsion and attraction, respectively. GPI-anchored ephrin-As probably require a transmembrane coreceptor (“coreceptor X”) to elicit intracellular signaling. Domain structure of EphAs and ephrin-As is shown on the right. The ephrin-B/EphB signaling system presumably functions in symmetry to ephrin-A/EphA, with parallel forward and reverse signaling in the LMCM and cis-attenuation in LMCL (not shown). For simplicity, Ephs are depicted as dimers, although they are known to assemble higher-order signaling clusters upon ligand binding (Egea and Klein, 2007). Neuron  , 1-3DOI: ( /j.neuron ) Copyright © 2011 Elsevier Inc. Terms and Conditions

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