Table 2.

Geometric mean relative expression of HERV-K RNA in ALS cases and controls

	HERV-K gag	HERV-K pol	HERV-K env	HERV-K gag	HERV-K pol	HERV-K env
Normalisation methoda	GAPDH	GAPDH	GAPDH	XPNPEP1	XPNPEP1	XPNPEP1
ALS	1.001	1.025	0.975	0.868	0.888	0.845
Control	1	1	1	1	1	1
p value	0.677	0.671	0.990	0.113	0.095	0.055
Statistical significance	NSb	NS	NS	NS	NS	NS

^a Normalisation against either GAPDH or XPNPEP1 reference genes

^b NS = the difference was not statistically significant at p < 0.05