The researchers designed such an experiment. They collected nerve cells from the experimental mice and implanted them into the brains of domestic mice. The experimental mice lived only about 18 months. The domestic mice lived twice as long. It was found that when the house mouse died, the nerve cells implanted from the experimental mouse were still alive. Which of the following can be used as the conclusion of the above experiment? ['Nerve cells in laboratory mice live longer than the organism to which they belong.', 'Nerve cell life span of family members is longer than that of experimental mice.', 'The life span of nerve cells in experimental mice is longer than that of house mice.', 'Nerve cells can survive indefinitely through transplantation.']