Quin 2 potassium salt hydrate is a preparation of the fluorescent Ca2+ chelator that presents a fluorescent signal upon chelation of Ca2+ ion. Quin 2 has been deployed in studies investigating cytoplasmic free Ca2+ concentrations in cells, and is used to measure and manipulate the Ca2+ concentrations for investigation.
1. Tsien, R.Y., et al. 1982. J. Cell Biol. 94: 325-334. PMID: 6980885
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