Table 2. Sensory neuron survival in vitro.

	Control	NGF	GDNF	Artemin	NRTN
6 h (%)	100	100	100	100	100
1 d (%)	85.31±0.69	96.24±1.13*	92.38±2.06*	94.12±2.09*	81.95±5.23
4 d (%)	73.22±3.27	89.53±1.64*	87.71±1.80*	88.48±1.94*	76.16±4.43

The number of NeuN-positive neurons 6 h after plating was designated as 100%. Without growth factors (Control), approximately 15% of neurons died 1 d after plating and 27% died by 4 d. Application of NGF, GDNF and ARTN significantly increased neuron survival although NRTN was ineffective.

*p<0.05; Two way ANOVA, Dunnett's post-hoc test.