求两篇文献，谢谢！

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Reelin Signals through Apolipoprotein E Receptor 2 and Cdc42 to Increase Growth  Cone Motility and Filopodia Formation

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- ]& q! o$ Y' Z. b7 n( ?Semaphorin 4D/Plexin-B1 Stimulates PTEN Activity through R-Ras GTPase-activating Protein Activity, Inducing Growth Cone Collapse in Hippocampal Neurons