To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 4 Circulation during the foot retraction. Mid-longitudinal T1w-MR image from the resting state to the foot extension obtained every 0.64 s. From images shown in Fig. 5C, 128 images from -10 s to 71 s are replayed at 10 flames per second. Roles of Keber's valve and foot chamber for foot manipulation in the mussel Nodularia douglasiae Eriko Seo, and Yoshiteru Seo Biology Open 2018. 8:None-None; doi: 10.1242/bio.039859 Download Original Video