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