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Immune system

infected bacteria

A newly-discovered immune system in bacteria is the distance ancestor of one in our own cells

Senescent cells

Helping the immune system clear away old cells in aging mice helped restore youthful characteristics

Immunofluorescence microscope image of the choroid plexus. Epithelial cells are in green and chemokine proteins (CXCL10) are in red

Weizmann Institute researchers suggest that the brain's “immunological age” is what counts...

Tunneling electron microscope image captures two goblet cells secreting their contents into the intestine

Substances secreted by unique cells in the gut lining keep bacteria in their place

Live two-photon microscopy of the small intestine

How does the immune system in the gut distinguish between helpful microbes and those that wish us harm?



Immunostaining of brain section in which the epithelial choroid plexus expresses TGF-β (green), hanging in the brain ventricle, the keyhole-like structure delineated by the ependymal lining (red). In the box, monocytes (green) entering via the choroidal vasculature. The composition reflects the immune-educative nature of the choroid plexus as a gatekeeper of the route to the injured parenchyma

Shifts in our immune system as we age might explain how older brains get “rusty”

Electron micrograph of bacteriophages Image: Dr Graham Beards, Wikimedia Commons

The beneficial bacteria in our guts are open to attack from viruses

Bit.flow | Julius Popp. Installation, 2004-2008
Millions of immune cells are on the move in our bodies, passing on information about possible threats along the way