MOVIE S3. Normal clearance of murine respiratory tract is mediated by discontinuous Muc5b and Muc5ac mucus clouds

Movie S3. Charcoal particles are collected and transported by mucus bundles. The mouse trachea was mounted and submerged in a buffer containing Alcian blue and charcoal, the tissue tilted and the movement of charcoal on the proximal part of the trachea recorded by video microscopy.