Role of Kinetochore in Mitosis

During cellular division, specifically mitosis, various proteins play essential roles in ensuring that chromosomal separation occurs correctly. Among these proteins are kinases, which are enzymes that modify other proteins by adding phosphate groups. This process is crucial for regulating the cell cycle. However, disruptions in these processes can lead to severe consequences including cancer. Which of the following proteins is primarily responsible for anchoring chromosomes to the spindle apparatus during mitosis?