Netrins are secreted axon guidance molecules that guide growing commissural axons towards the midline. They are capable of eliciting either attraction or repulsion of axons by binding to fra or unc-5 receptors. (Adapted from FBrf0191277).
Notes on Group
In Drosophila, the DCC and UNC-5 receptor families are represented by one member only - fra and unc-5, repectively.