Tumor Bound (IMAGE) Brown University Caption Cancerous rat cells (black) expressing the protein Pannexin1 are bound within a strong network of actin (red), while adjacent cells that don't express Pannexin 1 (green) have much less developed actin network around them. Credit Brian Bao/Brown University 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.