Kinetochore

The term kinetochore (Greek kinesis movement; Choros place ), was once a synonym for the centromere ( primary constriction ) of a chromosome. After the newer terminology is called by this term a special plate or hemispherical structure of proteins and DNA segments which side sits the centromere and is used in nuclear division processes as a starting point for the fibers of the spindle apparatus. After the spindle fibers ( microtubules ) have docked at the kinetochore, a protein complex begins to solve the binding of sister chromatids. Once the sister chromatids no longer stick to one another, they are drawn during early anaphase of the microtubules to the poles of the spindle apparatus.