sentence: Organisms also use stem cells to replace damaged cells during their lifetime.
sentences_before: When an organism grows, stem cells specialize, and take specific functions. For instance, mature tissues like skin, muscle, blood, bone, liver, nerves, all have different types of cell. Because stem cells are not yet differentiated, they can change to become some kind of specialized cells.
concept_name: organism
headings: Stem cell
categories: Developmental biology Cells