Iron is an essential trace element in biological cells. The concentration of the element and its so-called redox state—it can exist either in a doubly ionized state as iron (II) (Fe2+) or a triply ionized state as iron (III) (Fe3+)—play a key role in metabolic processes such as cellular respiration and in microbial stress responses.
Novel biosensor enables real-time tracking of iron (II) in living cells
