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PrPsc polymer growth scenarios for the case s* > s1. The parameters are the same as in Fig. 5 except for a = 0.1, which corresponds to s* = 122.11 and s1 = 96.76. (Top) s(0) < s1 (y10(0) = 5 × 105); (middle) s* > s(0) > s1 (y100(0) = 5 × 104); and (bottom) s(0) > s* (y500(0) = 104). In all cases the total initial inoculation is z(0) = 5 × 106.
