Dilution Control 1 μl TPI 6 μl TPI
10-2 8/8 NT NT
10-3 6/9 NT 1/7
10-4 4/9 0/8 3/10
10-5 0/9 0/10 0/10
10-6 0/10 0/9 0/9
10-7 0/9 0/9 0/9
Table 2: Westrn-blot results: PrPsc positive mice brains/total examined.