
Crick and Watson's DNA Molecular Model
1953
1953
1953
1934
1935
1942
1948-1953
1955
1955
1940
1951
1946-1950
1949
1945-1955
1935
1935
1934-1935
1950-1952
1946
1951-1953
1945
1938
1948-1950
1943
1839 (original); circa 1988 (replica)
1936
1949
1935
1948-1953
circa 1925
1945
1926
1948
1946
1955
1955
1943
1948
1957
1927
1957
1940
1927
1938
1947
1947
1932-1942
1924
1940
1938
1923-1948