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	Date	Assigned_by	Comment
PR:000000072	activin/inhibin beta subunit			enables	GO:0005102	signaling receptor binding			PIRSF:PIRSF037268	ISS		PIRSF:PIRSF037268	PIRSF:PIRSF037268	20080301	PRO:CNA