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Science in 60 breaks down the latest research at Whitehead Institute through one-minute explainers. In this video, Xochitl Luna discusses investigating the role of microglia—the brain’s resident immune cells—in multiple sclerosis.

When genetic information is passed along to offspring, different versions of the same gene typically have equal chances of being transmitted. But some “selfish” genes break this rule to stack the odds in their favor. Whitehead Institute Member Yukiko Yamashita and colleagues have discovered one such gene—except it also uses a novel mechanism to limit its own “selfishness”.