Differential expression and GSEA results. A PC1 and PC2 axes from the principal components analysis of all genes for the 40 samples. B Venn diagram comparing the DEGs between current-day and elevated CO2 levels in the CNS and eyes. C Venn diagram comparing the GO terms / functional categories found to be significantly different between current-day and elevated CO2 levels in the CNS and eyes by GSEA. circle = CNS current-day, square = CNS elevated CO2, diamond = Eyes current-day, triangle = Eyes elevated CO2, ↑ = upregulated at elevated CO2 conditions, ↓ = downregulated at elevated CO2 conditions.