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Fluorescent indicators for calcium are incredibly powerful because they enable researchers to watch the movement of calcium ions in real time in living cells. The popular small molecule indicator Indo-1 has now been targeted to a defined location, namely, the nucleus of muscle cells, using SNAP-tag technology. This combination of a chemical probe with genetic targeting expands the available options for measuring local calcium events in cells.
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Amy E. Palmer (2009) studied this question.
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