In 1682 ; Organ donation started, a scientist used a bone of a dog to treat it for a skull injury.
In late 1800s ; Xenotransplantation started, when frog skin were used to treat burns and ulcers.
In 1905 ; a French scientist grafted kidney tissues in a child from a rabbit , but the child died after two years.
In 1997 the pig fetal nerve cells were used to cure the Parkinson’s disease.