sentences:  In addition, other studies have shown that certain cells that interact with pioneer axons are also crucial in the eventual development of neural pathways, and that loss of these cells results in improper navigation of pioneer axons.Furthermore, identical pathways and homologous neurons across different species reflect different pathfinding abilities of growth cones in pioneer neurons.An investigation was conducted looking into the role of pioneer axons in the formation of both CNS and PNS axon pathways in a "Drosophila" embryo.