Netrins are released by the floor plate and are picked up by receptor proteins embedded in the growth cones of axons belonging to neurons in the developing spinal column.
Netrins are released by the floor plate. Netrins are picked up by receptor proteins. These receptor proteins are embedded in the growth cones of axons. These axons are belonging to neurons in the developing spinal column. A proposed model for netrin activity in the spinal column of developing human embryos is this.