Regional identity of VLM unaffected by current alone or current + GFP. (A) Expression profile of ten marker genes of the VLM obtained from the microarray analysis of VLM (wild type (WT)), VLMi and VLMg. In all conditions, marker genes are seen at the expected levels, and there is little difference between the three conditions. (B) Box plot showing the normalised expression values for all ten marker genes. All conditions have the same median and error bars overlap, indicating that the ten marker genes are not significantly differentially expressed between the three conditions. This shows the regional identity is not significantly affected by exposure to current or current + GFP. Statistical analysis using one-way ANOVA also shows that these marker genes are not differentially expressed.