
Crick and Watson's DNA Molecular Model
1953
1953
1949
1948-1953
1949
1945-1955
1957
1950-1952
1955
1939-1955
1945
1942
1951
1940
1953
1945
1948
1946
1955
1955
1943
1948
1957
2000-100 BCE
1945
1947
1940
1955
1955
circa 1955
1942
1946
1941-1950
1940
1950
1953
1951
1955
circa 1950
1950
1948
1951
1955
1940-1945
1957
1950
1945-1955
1940-1949
1942
circa 1950
1950-1951