
Crick and Watson's DNA Molecular Model
1953
1953
1953
1920-1950
1901-1910
1905
1934
1935
1951
circa 1910
1903
1948-1953
1955
1950-1952
1920-1960
1918
1903
1936
1960
1942
1919
1935
1955
1951-1953
1920-1950
1918-1920
circa 1956
circa 1956-1959
1960
1920-1930
1909-1910
1949
1945-1955
1920-1950
circa 1919
1901-1930
1907
1948-1950
after 1903
1950
1956
1953
1959
1914-1918
1936
1946
1921-1930
1911
1920-1925
circa 1900
1953