(A) Detection of neurites in NB69 cells in response to retinoic acid. Representative phase contrast images of NB69 cells showing long neurites upon 13cRA treatment for 6 and 10 days. (B) Statistical analysis of various neurites upon 13cRA treatment in NB69 cells. Length of neurites from various selected fields were measured in μm and compared with neurites from untreated cells. Neurites were measured (μm-micrometer) from at least three independent experiments and p-values were calculated by one-way ANOVA using Prism followed by Tukey’s post-test. (DOC 296 kb