Fractions of Metrabase interaction records per data source. The total number of records is 11,649. ‘Pgp dataset’ and ‘HITDB dataset’ refer to the data taken from Poongavanam et al.  and Sedykh et al.  respectively. All the interaction data contained in Metrabase was extracted from the published literature: where datasource is ‘literature’, the data was extracted by members of the Metrabase Development Team.