This handout photo provided by the Baylor College of Medicine, taken May 20, 2014, shows Dr. Kjersti Aagaard in her laboratory at the Baylor College of Medicine in Houston. Aagaard’s new research shows a small but diverse community of bacteria lives in the placentas of healthy pregnant women, and hints that the microbes may play a role in premature birth. (AP Photo/Agapito Sanchez, Baylor College of Medicine)
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