I'd like to use the COSMIC data to compare with my mouse exome-seq data,
so I'm trying to convert the build of COSMIC data from hg19 to mm9.
But, actually when I open the 'convert genome coordinates' tool in the 'Lift-Over' menu,
the second dropdown box named as 'To' was unchangeable, just showing a message 'No options available'.
What should I do to solve this problem?