Nature, 408, 982–985 (2000).

The caption to Fig. 1 should have included the following statement: “Two transgenic mice vaccinated with Aβ consistently failed to make choices in the radial arm water maze during the 15.5 month testing period and could not be included in the statistical analysis. Thus the sample size is smaller for the behavioural studies performed at 15.5 mo than at 11.5 mo.”

All statistics, results (including means and standard errors in the figures), and the degrees of freedom and significance values in the text are correct as published. We have since replicated our findings with larger numbers of Aβ vaccinated transgenic mice (n = 20) whose performance in the radial arm water maze is again better than that of non-vaccinated transgenic mice.