As a next step, Enquist and colleagues hope to incorporate more control mechanisms into the virus. Recent advances in biotechnology have produced several tools for controlling gene activity beyond the cre gene used in the initial study. Biologists could rig these various control elements so that the virus emits different colored fluorescent markers when it encounters cells that have different protein attributes. Enquist's work is supported in large part by a grant from the National Institutes of Health. The Bulletin is published weekly during the academic year, except during University breaks and exam weeks, by the Office of Communications, Princeton University, Princeton, NJ 08544.
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