Molecular mechanisms underlying regeneration
5.   Signals that travel from injury site back to nucleus
Importinb increases after injury and binds to a nuclear
localization signal (nls); the entire complex travels
retrogradely to modulate the regenerative response
Hanz and…Fainzilber, 2003, Neuron 40:1095;
See also work of R. Ambron, Columbia P&S