
Crick and Watson's DNA Molecular Model
1953
1953
1953
1920-1950
1901-1910
1905
1934
1935
1951
1897
circa 1910
1903
1948-1953
1955
1950-1952
1918
1936
1903
1935
1955
1942
1951-1953
1920-1950
1918-1920
1919
circa 1956
1920-1930
1909-1910
1949
1945-1955
1897-1898
1920-1950
circa 1919
1901-1930
1907
1948-1950
1901-1930
1915-1918
1920-1940
1950
circa 1897
1920-1925
1953
1956
1899-1919
1953
1945
1939-1955
1914-1918
1901-1930
after 1903