
Crick and Watson's DNA Molecular Model
1953
1953
1953
1934
1935
1948-1953
1949
1949
1830 (original); 1967 (model)
1948-1950
1948
1946
1955
1955
1943
1948
1947
1935
circa 1955
1935
1934
1950
1950
1935
1951
1932-1936
1934-1935
1937
1946
1937
1954
circa 1955
circa 1942
1952
1955
1954
1952
1955
1954
1952
1954
1952
1954
1951
1935
1938 and 1951
1944-1945
1936
1934
2000-100 BCE
1938-1940