Aron Arthur Moscona, a developmental biologist who taught at the University of Chicago, has died at the age of 87. Moscana's work in the late 1950s to the early 1970s determined how cells in the developing embryo find each other and interact. His work led to the discovery of cadherins, cell surface molecules that allow cells to recognize and interact with one another. "It allowed other scientists ...

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Gene drives might run into biological resistance, the Economist reports.

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