You are working on a project in which you block autophagy in a particular portion of the brain of a laboratory animal. What happens to these animals? 1) Nothing happens since nerve cells are so long-lived. 2) That region of the nervous system experiences a massive loss of nerve cells. 3) There is slight, but not dangerous damage, to the organelles and proteins of the nerve cells. 4) There is continuous damage to the proteins and organelles of these long-lived cells.