
Crick and Watson's DNA Molecular Model
1953
1953
1953
1948-1953
1920-1950
1940
1934
1955
1957
1920-1925
1936
1920-1950
1945-1955
1935
1947-1958
1955
1955
1936
1945
1949
1945-1948
1920-1950
1949
1951
1925-1926
1950
1830 (original); 1967 (model)
1948-1953
1950
1947
1935
1930
circa 1930
circa 1955
circa 1942
1958
1956
1923-1939
1945
1920-1950
1920-1950
1931
1955
1947
1924
circa 1930
1955
1935
1940
1934-1935
1932-1936