The Technology Feature 'Two microscopes are better than one' (Nature 492, 293–297; 2012) wrongly stated that the enzyme APEX is a singlet oxygen generator, it is a peroxidase. Also, Alice Ting was a postdoc in the lab of Roger Tsien, not Mark Ellisman.
The online version of the original article can be found at 10.1038/492293a
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Correction. Nature 494, 138 (2013). https://doi.org/10.1038/494136a
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