Table 4. Blood distribution of ^99mTc-pa2H.

Sample	Time p.i.	Fraction	APP/PS1		Wildtype
	(min)		(%)	sd	(%)	sd
99mTc-pa2H	10	Plasma	88,9	6,2	80,3	5,2
		Cell Pellet	11,1		19,7
	90	Plasma	83,6	8,7	72,0	8,2
		Cell Pellet	16,4		28,0

At different time point after bolus injection of ^99mTc-pa2H blood collected from the tail vein of 12–14 month old APP/PS1 mice or wildtype littermates. Separated into the cell pellet and plasma, samples were counted for radioactivity. Fractions are expressed in percentage of total activity at that time point. No significant differences were calculated using a student t-test (p<0.05).