process has causal agent TOR signaling TOR signaling pathway TOR signalling pathway The series of molecular signals mediated by TOR (Target of rapamycin) proteins, members of the phosphoinositide (PI) 3-kinase related kinase (PIKK) family that act as serine/threonine kinases in response to nutrient availability or growth factors. Note that this term should not be confused with 'torso signaling pathway ; GO:0008293', although torso is abbreviated 'tor'. target of rapamycin signaling pathway TOR signal transduction TOR signaling cascade biological_process target of rapamycin signalling pathway GO:0031929 intracellular signal transduction TOR complex