Experimental Soft Condensed Matter Group Harvard University, Prof. D. A. Weitz Cool Picture of the Moment

Inverted fluorescence image of cells in drops of a water-in-oil emulsion. These yeast cells produce the enzyme, beta-galactosidase, in response to stimulation by alpha-factor. The cells are encapsulated in drops together with a fluorogenic substrate; fluorescein is produced when the enzyme cleaves the substrate. Drop diameter = 40 microns.

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