Adhesive Shellfish (IMAGE) Max-Planck-Gesellschaft Caption Holding on tightly: Some shellfish attach themselves to a foundation with proteins containing the amino acid dopa. Adhesion is equally good whether the protein contains a high proportion or a low proportion of the substance. Credit Creative Commons / Andreas Trepte, Marburg Usage Restrictions Creative commons. 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.