to determine if these changes associated with aging are accompanied by alterations in the production of muscle-derived neurite-outgrowth factors , we examined the effects of soluble and cell surface-associated components from innervated and denervated 10- and 25-month rat edl muscles on a motoneuron-enriched fraction of embryonic chick spinal cord cells in vitro .
C0243092
cell
C0007634
cells