Fig. 8.
FGF and retinoic acid signaling pathway related genes show increased expression in the lesioned adult spinal cord. PCR analyses of unlesioned and lesioned (14 days post-lesion) spinal cord, using GAPDH levels as a standard, are shown. All indicated genes show robust up-regulation in lesioned tissue. Ptc1 as an indicator for Shh pathway activity is included as a positive control.