Leopard Shark Gill Cells (IMAGE) University of California - San Diego Caption Under normal conditions (before feeding) the protein is inside of the cell, and during experimental treatment (which was after the animal was fed) the protein moves to the cell membrane. Acid-secreting protein in green. Credit Scripps Oceanography/UC San Diego 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.