====== How to filter proteins or protein groups  ======

Filtering can be done on 1 or more User Context. Once desired contexts are selectedn right-click in //MSI database// ans select //Proteins Filters// window or choose //MS Identification --> Context --> Proteins Filters//

{{:how_to:filterproteins.png | Contextual Menu}} {{:how_to:filterproteins2.png| General menu}}

All available filters are listed in the menu. To get more explanation on what filtering means, see [[userguide:proteinfiltering|Protein Filters]] page

====== Regular Expression filter ======

This filter is the same as the one used to select new typical protein (see [[how_to:changetypicalprotein|change typical protein)]] but only one rule composition could be specified. 

{{:how_to:regexpfilter.png|}}

====== Peptide Count filter ======

This filter allow user to mask protein group which 
  -  have less than x peptides (as grouped by hEIDI) or less than x peptides with different sequences (without taking into account the peptide mass) depending on the user choice.
  - optionally, the peptide score option could be specified to retain protein having less than x peptides but each of them having a score higher than specified one.


{{:how_to:peptidecountfilter.png|}}

====== Occurrence in child contexts ======

This filter allow user to mask protein that are not seen in at least ''X'' child context. This filter could only be used on context which groups at\\
{{:how_to:childoccurencefilter.png|}}