
Crick and Watson's DNA Molecular Model
1953
1953
1953
1942
1948-1953
1945
1935
1935
1955
1950-1952
1946-1950
1936
1949
1949
1945-1955
1948-1950
1948-1953
1945
1948
1946
1955
1955
1943
1948
1940
1947
1940
1955
1938
circa 1955
1940
1936
1950
1953
1938
1938
1950
1951
1937
1955
1954
1949
1951
1953
1936
1937
1955
1954
circa 1953
circa 1955
1944