(IMAGE) Université de Genève Caption Examples of protrusions formed by confinement of muscle cells on adhesive discs. The disc, slightly larger than the diameter of the protrusion, is visible at the base. On some protrusions, the vortex organization is visible. The twisted shape of other protrusions is also indicative of rotational forces. Credit UNIGE Usage Restrictions none License Original 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.