These lymph ducts drain a milky white fluid that contains byproducts of immune activity away from areas of inflammation and infection.

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Both drugs turn off a natural brake on immune system activity called CTLA4 (cytotoxic T-lymphocyte antigen 4).

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In particular, low-status individuals showed high levels of activity in genes associated with the production of various immune-related cells and chemical signalling factors, as well as those to do with inflammation (a general immune response that involves tissue swelling and increased immune-cell activity in the affected area).

ECONOMIST: Social status and health

In keeping with previous work, they found that high- and low-rank individuals showed different levels of responsiveness to a class of hormones called glucocorticoids, which regulate immune-system activity and response to stress.

ECONOMIST: Social status and health

They added that no sector was immune from inspection and enforcement activity and reactive inspections would continue.

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Gene hunters have long focused on a mere 1.5% of the human genome, an estimated 25, 000 genes that code for proteins and thereby control the immune response, organ growth and brain activity, among other things.

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If you go too far, however -- either with extreme short-term activity or long-term overtraining -- the immune system weakens.

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But when the investigation was turned over to the Justice Department to examine possible criminal activity, FBI agents discovered some guards believed they were immune from prosecution and therefore refused to be interviewed again, complicating the FBI probe.

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Once inside, the zinc then put the brakes on further activity in the NF-kB pathway, slowing down the immune response and limiting the amount of inflammation, the study, in Cell Reports, indicated.

BBC: Zinc 'keeps immune system in check'