Crick and Watson's DNA Molecular Model
1953
1953
1920-1960
1948-1953
1963
1935
1964
1955
1920
1960
1956
1926-1932
1963
1956
1934-1935
1955
1990-96
circa 1956
1940
1957
1937
1964
1950
1963
1950
1957
1956
1945
c. 1933
1940-1944
1955
1956
1921
1938-1940
circa 1964
1948
circa 1955
1959
1951
1955-1965
1925
1928
circa 1960
1950-1959
1962
circa 1940
1950-1959
1950-1960
circa 1955
1960-1961
circa 1950