What it does

Lists regions of heterozygosity.

>ambig
ACGTMRWSYKVHDBN

The seqtk suite recognises MRWSYK:

#chr    position  base
ambig   5         M
ambig   6         R
ambig   7         W
ambig   8         S
ambig   9         Y
ambig   10        K

Attribution

This Galaxy tool relies on the seqtk toolkit from lh3/seqtk, developed by Heng Li at the Broad Institute