Live cell imaging probe for labile ferrous (Fe²⁺) ions, localising inside endoplasmic reticulum (ER). Also suitable for flow cytometry.

BioTracker far-red labile Fe²⁺ dye is a fluorescent probe that specifically detects labile iron (II) ions (Fe²⁺). This probe is designed to selectively react with only Fe²⁺ separately from other metal ions and irreversibly turns into a far-red fluorescent substance. It mainly localises inside endoplasmic reticulum (ER) and/or golgi bodies. It can also be used with a flow cytometer equipped with a red laser. FerroFarRed shows almost no cytotoxicity at concentrations up to 100 μM (~20 times that of generally used concentrations).