Image: Slit1 Enhances Neurite Outgrowth. A: Chick dorsal rootganglion neurons were grown on nitrocellulose-coated plates in the presence of recombinant human NGF-b B: Neurite outgrowth is enhanced when the plate is also coated with recombinant mouse Slit1 (90 ng/3 μL for 2 hours).