Biology of Breathing (IMAGE) Cincinnati Children's Hospital Medical Center Caption This image from a study in the journal Immunity shows fluoresced cells in the developing perinatal lung of baby mouse as it forms air sacs called alveolar. The areas highlighted by dotted circles show the molecular components that form Type 3 innate lymphoid cells, which help lungs development a durable immune defense against microbial infections. Not shown is a companion comparison image that shows dysfunctional development in the lung of a premature baby mouse. The illustrations at left diagram normal and premature development of air sacs. Credit Cincinnati Children's Usage Restrictions Credit Cincinnati Children's License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.