SIF format

The SIF format (simple interaction format) is a space/tab separated format that summarizes interactions in a graph. It is a very simple format where every row corresponds to an individual interaction (edge) between a source and a target node.

nodeA relationship nodeB
nodeC relationship nodeA
nodeD relationship nodeE

A real example with protein-protein interaction data would look like this:

Q13501	pp	Q9NUJ1
Q96AP0	pp	Q9NUX5
P12956	pp	Q96AP0
Q96AP0	pp	Q9BSI4

where pp stands for protein-protein. The relationship field can contain any name that describes the interaction and can be used later on as an attribute for edges. For more information regarding edge attribute mappings see Network and attributes visualization.

Duplicated rows will be ignored. Multiple edges between the same nodes must have different relationship types.