Quin II is a fluorescent Ca2+ indicator compound. Quin II is a quinoline-based compound that is described to function as an indicator of intracellular Ca2+ concentration and to also serve as a buffer of intracellular Ca2+ levels. There is a shift in the UV spectrum upon binding calcium and fluorescence is enhanced.
1. Tsien, R.Y., et al. 1982. J. Cell Biol. 94: 325-334. PMID: 6980885
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