Effects of TrkC silenced, with NT-3 on mitogen-activated protein kinase (MAPK) activation in HNC. a Growth rates of HNC effected by NT-3 with 10, 20,40 and 80 nM at 2, 4, 6 and 8 day. b The expression of ERK1/2, JNKs, p38 and phosphorylation of ERK1/2, JNKs, p38 in protein level with NT-3 20 nM. c Contrast gray value of phosphorylation of ERK1/2, JNKs and p38 with NT-3 20 nM