Mechanisms regulating cell populations A balance among cell proliferation,cell death by Prolifer ation apoptosis,and emergence of new differentiated cells from Differentiation stem cells 8 ← od Stem cells Normal cell population at steady state DNA replication and mitosis Cell death (apoptosis)Mechanisms regulating cell populations  A balance among cell proliferation, cell death by apoptosis, and emergence of new differentiated cells from stem cells  DNA replication and mitosis