In (19) , the new cells are of the same type as those that were destroyed, whereas in (20), a new type of tissue develops that eventually causes (21) production. (22) cells continue to divide throughout life. Damage to these cells can be completely repaired by regeneration. (23) cells do not actively replicate after growth ceases, but they do retain the ability to divide if necessary and are capable of regeneration. (24) cells have very limited ability to replicate, and, if killed, they are replaced by a different type of cell.