Pathology General 5f22dfd1 Why do fetal cells continue to divide but terminally differentiated adult cells do not divide? A There are many cyclin inhibitors which prevent cell to enter into S phase in adult B Phosphatase absent in fetal cells C Proteinase is absent in fetus D Absence of CD kinase High-Yield Explanation . There are many cyclin inhibitors which prevent cell to enter into S phase in adult