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The design and engineering of organic fluorescent Ca2+ indicators approximately 30 years ago opened the door for imaging cellular Ca2+ signals with a high degree of temporal and spatial resolution. Over this time, Ca2+ imaging has revolutionized our approaches for tissue-level spatiotemporal analysis of functional organization and has matured into a powerful tool for in situ imaging of cellular activity in the living animal. In vivo Ca2+ imaging with temporal resolution at the millisecond range and spatial resolution at micrometer range has been achieved through novel designs of Ca2+ sensors, development of modern microscopes and powerful imaging techniques such as two-photon microscopy.
(Russel., 2011) Imaging calcium signals in vivo: a powerful tool in physiology and pharmacology. Br J Pharmacol.