Updated publication reference for PubMed record(s): 29176613. After extraction with mild non-denaturing detergents, we affinity-purified 785 endogenously-tagged CEPs and then identified stably-associated polypeptides by precision mass spectrometry. The resulting high-quality physical interaction network, comprising most (77%) of all targeted CEPs, revealed hundreds of previously unknown heteromeric complexes. Lab Heads: Andrew Emili; andrew.emili@utoronto.ca ;Donnelly CCBR, University of Toronto, Toronto ON M5S 3E1, Canada Mohan Babu; mohan.babu@uregina.ca ;Research and Innovation Centre, University of Regina, SK S4S OA2, Canada