Relative abundance of race 4-enriched genes at four different stages in race 4 compared with that in race 3.

aThe expression level of genes was analyzed with the 2−ΔΔCt method using the GAPDH gene as an internal reference gene for normalization. The calibrator was the transcript level of the corresponding gene in race 3 at the same developmental stage.bThe relative abundance of the gene indicated was very close to zero.