Two years ago, whenever members of Jon Lundberg's team at Karolinska University wanted to get near their lab mice, they donned sterile gloves and reached into a steel isolator box. Not typical research rodents, these creatures had been bred to be completely germ-free. The technicians in the animal lab delivered the baby mice by cesarean section and kept them in complete isolation to eliminate the chance that bacteria would enter the rodents' bodies.
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