What reagent is needed to accomplish the transformation below? 
Definitions:
Growth Cones
The dynamic, amoeba-like extensions of a neuron's axon tip that explore the environment to guide axonal growth during neural development.
Neurons
Specialized cells in the nervous system that transmit information to other nerve cells, muscles, or gland cells, primarily through electrical and chemical signals.
Axons
Long, slender projections of neurons that transmit electrical impulses away from the neuron's body.
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