Best software for identifying the pathways

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g a
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Best software for identifying the pathways

Dear All

Can you please suggest the name of a few freely accessible softwares for analyzing the protein interactions and their relate pathways both at gene or protein level.

I am a hardcore proteomics person and recently learnt that a few genes that can upregulate the proteins that I have identified through  nLC- MS/MS. I now want to check what is regulating these proteins at the gene level.

Kindly suggest some softwares for the identification of protein interactions and pathways.

Thanking you all in anticipation