Table 1.

Animal data

	Young (1.5 to 3 months)	Aged (18 to 32 months)
Scanned with rapid arterial blood sampling (n)	12	10
Metabolite analysis (n)	7	8 (4 were also scanned)
Brain TACs used for kinetic analysis (n)	12	14
Body weight (g)	215 ± 3 (1.5 months, n = 9)	605 ± 28
	308 ± 8 (3 months, n = 10)
Brain weight (g)	1.73 ± 0.03 (1.5 months)	2.15 ± 0.08
	1.90 ± 0.04 (3 months)
Injected tracer dose (MBq)	14.7 ± 2.8	26.8 ± 6.2
Injected mass (nmol, max.)	0.15 ± 0.03	0.27 ± 0.06
Injected mass (pmol/g, max.)	5.7 ± 1.1	4.5 ± 1.0