G S. Horan, et.al., Homeotic transformation of cervical vertebrae in Hoxa-4 mutant mice., Proceedings of the National Academy of Sciences of the United States of America, 1994, 91
G S. Horan, et.al., Homeotic transformation of cervical vertebrae in Hoxa-4 mutant mice., Proceedings of the National Academy of Sciences of the United States of America, 1994, 91