PRO_ID	Object_term	Object_syny	Modifier	Relation	Ontology_ID	Ontology_term	Relative_to	Interaction_with	Evidence_source	Evidence_code	Taxon	Inferred_from	DB_ID	Protein _region	Modified_residue, MOD_ID	Date	Assigned_by	Equivalent_Form	Comment	Protein_Features
PR:000025950	smad2-smad4-ski protein complex			participates_in	GO:0030512	negative regulation of transforming growth factor beta receptor signaling pathway			PMID:10705283|PMID:15107821	EXP						20101005	PRO:CNA