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The RPeD1 growth cone-induced collapse of the nontarget growth cone was prevented by the D1 receptor antagonist. The nontarget cell growth cone (bottom) collapsed on approach to an RPeD1 growth cone (A,B). The D1 receptor antagonist was bath perfused (C), and the growth cone recovered and advanced toward the RPeD1 growth cone, making physical contact (D–F). Frames are 15 min apart.
