Stage-specific expression pattern of the M. persicae gene MpNav H1 in the whole insect body analyzed by qRT-PCR. The letters above the bars show significant differences (least significant difference in one-way analysis of variance, P < 0.05) in MpNav expression. Means with the same letter are not significantly different. Mean ± SEM of three independent experiments are shown. RNA was normalized with Actin as the internal control.