Curiox Biosystems 1 article published in JoVE Immunology and Infection Identification of Mediators of T-cell Receptor Signaling via the Screening of Chemical Inhibitor Libraries Elijah W. Chen*1, Chyan Ying Ke*2,3, Joanna Brzostek*1, Nicholas R. J. Gascoigne1, Vasily Rybakin1,4 1Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, 2Singapore Immunology Network, A*STAR, 3Curiox Biosystems, 4Department of Immunobiology, Rega Institute for Medical Research, Katholieke Universiteit (KU) Leuven This paper uses a flow-cytometry-based assay to screen libraries of chemical inhibitors for the identification of inhibitors and their targets that influence T-cell receptor signaling. The methods described here can also be expanded for high-throughput screenings.