The kinetochore (/ kɪˈnɛtəkɔər /, / - ˈniːtəkɔər /) is a protein structure on chromatids where the spindle fibers attach during cell division to pull sister chromatids apart. Their proteins help to hold the sister chromatids together and also play a role in chromosome editing.
what holds the sister chromatids together and attaches them to the spindle fibers
kinetochore