Table 2. Candidate HKGs in geNorm evaluation.

Rank	Temporal Cortex		Frontal Cortex		Hippocampus		Hypothalamus		Total
	Gene	M-value	Gene	M-value	Gene	M-value	Gene	M-value	Gene	M-value
1	ACTB	0.338	GAPDH	0.411	HPRT	0.378	GAPDH	0.252	GAPDH	0.642
2	GAPDH	0.353	ACTB	0.427	β2M	0.384	β2M	0.271	HPRT	0.663
3	β2M	0.399	HPRT	0.473	ACTB	0.395	ACTB	0.296	β2M	0.728
4	HPRT	0.402	18S	0.474	GAPDH	0.420	HPRT	0.308	ACTB	0.762
5	18S	0.563	β2M	0.520	18S	0.555	18S	0.383	18S	1.065

Ranking of candidate HKGs by geNorm for each brain structure and all structures together as described by the total M-value. Lower M-values indicate more stable genes. A cut-off value of 1.5 was used.