Murine DRG explants dissected from embryonic day (E) 13 C56BL/6J mice were cultured on poly-L-lysine (PLL) and laminin-coated 24-well plates in Neuro-medium (Miltenyi Biotec) containing 10% FBS and 25 ng/ml nerve growth factor (NGF) (Harlan Bioproducts). After 24 h, the culture medium was changed to Neuro-medium supplemented with 2% Neuro-Brew-21 (Miltenyi Biotec), 25 ng/ml NGF, and 1 mM Glutamine in addition to a mixture of 1 mM 5′-fluoro-2′-deoxyuridine and 1 mM uridine to remove non-neuronal cells. The in vitro Wallerian degeneration of axons was introduced by removing cell bodies at 10–14 d in vitro using a pipette tip.5,6 (link)