Watching axons on the move.

Summary: Think of nerve cells like explorers trying to build a road network in a new city. They send out long cables, called axons, to connect with other parts of the body. But how do these cables know where to go without getting lost?

Scientists found that a helper molecule called Netrin acts like a smart GPS. It uses two different tricks depending on the distance. When the destination is far away, Netrin acts like a smell in the air (chemotaxis) to pull the axon in the right direction. When the destination is close, Netrin acts like a sticky trail on the ground (haptotaxis) for the axon to crawl along. This double-duty system ensures our nerves connect perfectly.