Hello Yanina,

According to the MACS documentation (also linked from the tool form):
http://liulab.dfci.harvard.edu/MACS/00README.html

The option controlling duplicates is (quote):

  --keep-dup=KEEPDUPLICATES

  It controls the MACS behavior towards duplicate tags
  at the exact same location -- the same coordination
  and the same strand. The default 'auto' option makes
  MACS calculate the maximum tags at the exact same
  location based on binomal distribution using 1e-5 as
  pvalue cutoff; and the 'all' option keeps every tags.
  If an integer is given, at most this number of tags
  will be kept at the same location. Default: auto

Galaxy implements this as the option on the tool form as
"Pvalue cutoff for peak detection:" with "1e-05" as the default.

Hopefully this helps!

Jen
Galaxy team

On 8/31/12 8:38 AM, Yanina Bogliotti wrote:
Hi,

Does MACS remove duplicate reads automatically during the peak calling?
I'm running controls for all the samples.

Thanks for your help,

Yanina


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