Cool game on Axons

We're pretty much past this section but I stumbled on a game that shows how axons form and lengthen using protein targets, how they have to compete w/ "rival axons", and how weaker connections cause cells to retract/commit cell suicide.  You can grow the axon into different cell types and the game links you to an actual science website.  Just an interesting way of learning about it:

http://www.kongregate.com/games/ExploreWellcome/axon