Table 2.

Stability ranking of the seven reference genes using four different algorithms

ΔCq		geNorm		NormFinder		BestKeeper		RefFinder
Gene	SD	Gene	M	Gene	SV	Gene	r	Gene	GM
β-actin	0.95	β-actin	0.29	GAPDH	0.31	GAPDH	0.972	β-actin	3.15
RPL40	1.02	RPL40	0.31	β-actin	0.33	β-actin	0.961	GAPDH	3.46
GAPDH	1.03	GAPDH	0.32	RPL40	0.45	EF1-β	0.953	RPL40	3.59
ARF1	1.13	18SrRNA	0.39	18SrRNA	0.49	RPL40	0.942	β-TUB	4.03
18SrRNA	1.15	β-TUB	0.48	EF1-β	0.56	β-TUB	0.932	EF1-β	5.12
EF1-β	1.23	EF1-β	0.55	β-TUB	0.79	ARF1	0.904	18SrRNA	5.69
β-TUB	1.31	ARF1	0.69	ARF1	0.94	18SrRNA	0.877	ARF1	6.37

GM, geometric mean; M, average of expression stability values; r, Pearson correlation coefficient; SV, stability value.