Table 6. Ranking and best combination of candidate genes determined from the analysis of pooled Ct values, by geNorm.

mRNA genes			npcRNA genes
M value	Name	Rank	Name	M value
0.29	GAPDH	1	miR-191	0.16
0.29	EEF1A1	2	miR-23a	0.16
0.39	ACTB	3	RNU6	0.34
0.74	RPLPO	4
GAPDH and EEF1A1		Best combination	miR-191 and miR-23a