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This seems to occur via immune cells interacting with the peripheral nervous system and releasing pain-producing chemicals (cytokines and chemokines).
en.wikipedia.org Engineers are not immune to being out of work, in heavy civil work some are employed on a project basis.
en.wikipedia.org Some cases may be triggered by the influenza virus, or by an immune reaction to the influenza virus.
en.wikipedia.org He possesses superhuman speed and strength and is immune to most forms of attack.
en.wikipedia.org The effect on the host also relies on the host having a weakened immune system.
en.wikipedia.org