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It is named after John Langdon Down, the British doctor who fully described the syndrome in 1866. Some aspects of the condition were described earlier by Jean-Ãtienne Dominique Esquirol in 1838 and Ãdouard SÃ©guin in 1844. In 1957, the genetic cause of Down syndrome, an extra copy of chromosome 21, was discovered.
In 1939, the Arizona state legislature issued a decree that Bear Down would be the exclusive property of The University of Arizona [citation needed]. Research at the State Archives does not find any record of such a decree: