
Crick and Watson's DNA Molecular Model
1953
1953
1953
1942
1948-1953
1945
1950-1952
1946-1950
1936
1949
1949
1948-1950
1948-1953
1945
1948
1946
1943
1948
1940
1938
1947
1947
1940
1938
1948
1938
1938
1938
1940
1942
1940
1936
1950
1953
1938
1938
1950
1951
1937
1938
1949
1951
1953
1946
1936
1937
circa 1953
1946
1951
1944
1950-1953