Table 1.

Aβ Levels in GK and WT Rat Brains (Means ± SEM, in pmol/g of Brain)

Age	5 to 7 months		10 to 14 months		7 months
Extraction	Diethylamine		Diethylamine		Guanidine HCl
Rat Strain	GK	WT	GK	WT	GK	WT
Number	11	12	7	4	6	7
Aβ X-40	0.55 ± 0.06	0.53 ± 0.05	0.54 ± 0.08	0.53 ± 0.12	0.91 ± 0.07	0.97 ± 0.08
	P = 0.39		P = 0.47		P = 0.31
Aβ X-42	0.41 ± 0.03	0.42 ± 0.02	0.41 ± 0.03	0.42 ± 0.06	0.42 ± 0.06	0.05 ± 0.00
	P = 0.34		P = 0.43		P = 0.13