
Crick and Watson's DNA Molecular Model
1953
1953
1953
1949
1935
1955
1951
1934
1953
1942
1948-1953
1955
1935-1945
1937
1943
1945-1955
1934-1935
1935
1935
1951-1953
1953
1945
1940
1940
1936
1940
1934
1935
1948-1953
1948-1950
1952-3
1948
1946
1955
1955
1943
1948
1940-1950
1932-1936
1930
circa 1930
circa 1955
1930-1940
circa 1942
1952
1954
1952
1954
1952
1954
1952