The easiest way to add contaminants is to find the ones you want from
your favorite source (IPI, UniProt, wherever) and manually copy them
into your database file.  If you open your database in a text viewer,
you'll see it has a very simple format.  Once you have your complete
database, you can use the Decoy Databases tool in the TPP to add
reverse sequence decoys (this is especially easy to do in Petunia).
When you create your appended database, be sure not to leave any blank
lines between entries, otherwise entries will get deleted when you
create your decoy database.

On Jan 27, 8:36 pm, 钟传奇 <[email protected]> wrote:
> Hi guys,
> I want to implement a database search, but I do not know how to create
> a composite database containing forward and decoy sequences with
> contaminants and trypsin. I know a software named
> "DecoyDatabaseBuilder" that can create a composite database from a IPI
> database, but that how to include the contaminants and trypsin
> sequences into the composite database troubles me.
> Could anyone help me?
> Thanks.

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