The surface of every cell contains receptors that react to external signals similar to a 'gate'. In this way, the cells of the innate immune system can differentiate between friend and foe partly through their 'toll-like receptors' (TLRs). Two parts of this gate often work together here, as researchers have now found out with the help of a new super-resolution optical microscopy technique.

Source: Zooming-in on protein teamwork