tˈuː mˈeɪn θˈiəɹiz ɛɡzˈɪst ˌɔn mˌaɪkɹoʊtˈuːbjuːl mˈuːvmənt wɪðˌɪn ðə sˈɛl: daɪnˈæmɪk ɪnstəbˈɪlᵻɾi ænd tɹˈɛdmɪlɪŋ.
Two main theories exist on microtubule movement within the cell: dynamic instability and treadmilling.