macs2 -g mm is what you need.
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When I use MACS2 to do peakcalling, i need to know genome size(gsize), and I use mm9. How I can know that? Thanks!
For MACS, genome size is already precompiled for common species. No need to do extra work. You can use mm for mouse.
This is explained in more depth in the documentation.
macs2 -g mm is what you need.
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Would FetchChromSizes be helpful?