  Axons are linear processes of nerve cells that can range from a few tens of
micrometers up to meters in length. In addition to external cues, the length of
an axon is also regulated by unknown internal mechanisms. Molecular motors have
been suggested to generate oscillations with an axon length-dependent frequency
that could be used to measure an axon's extension. Here, we present a mechanism
that depends on the spectral decomposition of the oscillatory signal to
determine the axon length.
