Frequencies of dystrophic neurites in wild type, APP23, and APP48 mice. The semiquantitatively assessed frequency of dystrophic neurites in the soma- and plaque-free frontocentral neuropil at the electron microscopic level was higher in 15-month-old APP23 mice than in wild type and APP48 mice of the same age group. In APP48 mice there was no increase in the frequency of dystrophic neurites in comparison to wild type mice. 3-month-old mice did not exhibit significant differences in the frequency of dystrophic neurites among the 3 genotypes nor were differences found in neuropil of the stratum radiatum and oriens of the CA1 region. (Data from APP23 mice and their respective wild type littermates were previously published in a different context
). *p < 0.05 (Further statistical analysis: Additional file
2). Means and standard errors are depicted.