Comparison of the response to GDNF to that of
NGF, FGF-2, and NT-3. Cultures were grown for 12 days in medium
containing 10% fetal bovine serum and 5% CEE in the presence of the
factors indicated. NGF, FGF-2, and NT-3 were present at 50 ng/ml and
GDNF was present at 10 ng/ml. The values are expressed as the
mean ± SEM of four to six cultures per condition. The NGF value
is statistically different from the GDNF, NT-3, and FGF-2 values with
P < 0.05.