Pulmonary surfactant-associated protein B

Pulmonary surfactant-associated protein B is a protein that in humans is encoded by the SFTPB gene.

Surfactant protein B is an essential lipid-associated protein found in lung surfactant. Without it, the lung would not be able to inflate after a deep breath out. It rearranges lipid molecules in the fluid lining the lung so that tiny air sacks in the lung, called alveoli, can more easily inflate.