Chapter 5 Section 1: Proteins and their cellular locations, after p. 185:
Topic Name: Kent State University Cell Biology
Tubulin is a "dynamic" protein; microtubules are "dynamic" structures and undergo various rearrangements depending on the needs of the cell. Go to this web site to look at other fluorescent images of microtubules and actin filaments in cells. Note especially the second image of microtubules in a dividing cell.