Channeling Efforts to Fight CF (IMAGE) University of Pennsylvania School of Medicine Caption Mucus-secreting serous acinus at ending of a pig submucosal gland showing the location of CFTR (green). Red shows the location of the protein NHE1 as a marker for the basolateral membranes, and the blue shows the location of the nuclei of the cells in the acinus. Credit Kevin Foskett, PhD; University of Pennsylvania School of Medicine Usage Restrictions None 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.