''Dynamics of growth cone are mediated by two processes''What are these processes?

The dynamics of growth cone are mediated by two key processes:

1. Protrusion: This is the process where the growth cone extends forward. It involves the assembly of actin filaments at the leading edge of the growth cone. This assembly pushes the membrane forward, leading to the extension of the growth cone.

2. Retraction: This is the process where the growth cone pulls back. It involves the disassembly of actin filaments at the rear of the growth cone. This disassembly allows the membrane to retract, leading to the retraction of the growth cone.

These two processes work together to guide the growth cone towards its target. The balance between protrusion and retraction, and the direction in which these processes occur, determine the direction of growth cone movement.