Some people will not feel tired even if they are under high intensity stress for a long time, and some people will feel tired after doing a little work, which may be related to different genes in addition to different constitutions or habits. The University of Szeged research team observed the genomes of 50 patients with chronic syndrome and found that some of these patients' genes are different from those of healthy people of the same age and gender. Which of the following, if true, would best support the results of this research in the diagnosis and treatment of chronic fatigue syndrome? ['Genetic identification has been applied in the diagnosis of some diseases.', 'Scientists identify genes that cause chronic fatigue syndrome.', 'There is no diagnostic method for chronic fatigue syndrome.', 'There is a unique gene in patients with chronic fatigue syndrome.']