Scientists identify pathway activated by interferon-gamma leading to tumor death
medicalxpress.com
medicalxpress.com
Cyto - cell, kine - movement
and covers a broad range of molecules, but generally excludes hormones and growth factors.
They are not exclusively to immune modulation, there are many other types too.
But like 99% of the time someone mentions cytokines in an actual conversation they are taking about inflammatory / immune signaling.[1]
Immune cells are far and away the largest class of circulating motile cells, no?
1. https://testdirectory.questdiagnostics.com/test/test-detail/...
Note that it isn't quite the same as literal vs figurative, since nobody's talking about metaphorical or poetic molecules.
______
With love perfuse, pen to paper,
It shall diffuse, sweet as vapor,
Take this letter, mine to thine,
There is no better Cytokine
Identifying these pathways would probably be by genetic sequencing, protein folding/behaviour analysis and extensive in-test-tube experimentation with living cell cultures.. but I'm not in the field so I don't really know. Maybe there's a voktage-gradient-memory-based (see Michael Levin's work) way to detect this type of misbehavior too? That'd be really cool!