# Actin --- **Actin** is a very important molecule, and is used all over in your body for all sorts of reasons. It's part of your [[cell|cell's]] [[cytoskeleton]], as well as in your [[muscle tissue|muscles]]. **Actin** fiber is made up of double stranded actin filiments. There is a - end and a + end. ![[actin.png]] **Actin** plays a vital role during [[cell division]] where it contracts and pinches off the cell into two seperate cells during [[cytokinesis]]. **Actin** is important during [[cell signaling]] as it attaches to the [[extracellular matrix|ECM]] via [[extracellular matrix|intergrins]]. ___