Mussel Foot Molds Thread (image) University of Washington Caption A mussel suspended in a University of Washington laboratory has already created one byssal thread and is reaching out its foot to mold a second strong, flexible thread. Mussels typically create 50 threads to anchor themselves in place. Credit L Coutts/Friday Harbor Laboratories/UW Usage Restrictions Credit required 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.