Table 4.

Candidate reference genes ranking according to NormFinder.

Rank	Gene symbol	SD	Accumulated SD
1	HPRT	0.164	0.164
2	B2M	0.178	0.121
3	GAPDH	0.191	0.103
4	SDHA	0.335	0.114
5	ACTB	0.358	0.116
6	RPL4	0.494	0.127

SD, standard deviation.