Quantitative analysis of undulation densities. CSS (see Materials and Methods), n = 5; nocodazole (N; 0.1 μM), n = 9; N (1 μM), n = 3; taxol (T; 1 μM), n = 3; T (1 μM) + N (1 μM), n = 3; T (1 μM) + N (50 μM), n = 8. n = total number of microscopic fields examined (field of 150×113 μm with average ∼50 axons). ++P < 0.01 vs. control CSS; Student’s t test.