β2-microglobulin gene duplication in cetartiodactyla remains intact only in pigs and possibly confers selective advantage to the species. - Le, Thong Minh; Le, Quy Van Chanh; Truong, Dung Minh; Lee, Hye-Jeong; Choi, Min-Kyeung; Cho, Hyesun; Chung, Hak-Jae; Kim, Jin-Hoi; Do, Jeong-Tae; Song, Hyuk; Park, Chankyu (PLoS ONE, 2017)