Having a list of genes for the potentially damaging SNPs, we can now
look for relationships between these genes. There are several tools
useful for this, including CTD, g:Profiler, and DAVID. For this
example we will use the CTD tool to extract pathway information from
the Comparative Toxicogenomics Database. Select the join results from
the previous step, and column 27 which has the gene symbols (blue box).
The identifier type we are using is NCBI gene symbols (which are the
same as HUGO), and for the output we want the pathways. Then click
Execute.
![[screen shot]](ctdWithArrows.png)