What are some examples of how animals are harmed during the animal testing process?

In laboratory mice. Vitamins are withheld to cause a disease and re admitted to cure the disease. some die grueling deaths while others get ill and die. Others get ill and get well again to live on to be made ill and recover more times. Other animals are given poison to see how and how fast they will die. Some are amputees and are used to see what effect the loss of limb or eye or ear will have on the animal.