
Crick and Watson's DNA Molecular Model
1953
1953
1953
1942
1948-1953
1945
1935
1935
1934
1955
1950-1952
1946-1950
1936
1949
1949
1945-1955
1948-1950
1948-1953
1945
1926
1948
1946
1955
1955
1943
1948
1957
1931
1927
1957
1940
1927
1938
1947
1947
1932-1942
1924
1940
1938
1955
1948
1955
1938
1938
1935
1938
circa 1930
1940
circa 1955
1928
1942