Table 2. Candidate reference genes ranked according to geNorm.

M values were calculated as average expression stability of reference genes during stepwise exclusion of the least stable control. V values were calculated as the pairwise variation between two sequential Normalization Factors.

Ranking	Gene	M value	V value
1/2	SDHA/PSMB6	0.24	-
3	HPRT1	0.27	0.086
4	PPMM1	0.29	0.069
5	TUBA1B	0.32	0.067
6	ACTB	0.35	0.061
7	YWHAZ	0.39	0.06
8	GAPDH	0.51	0.109
9	B2M	0.62	0.107