
Crick and Watson's DNA Molecular Model
1953
1953
1953
1955
1957
1960
circa 1956-1959
1955
1955
1949
1960
1949
1951
1950
1950
1960
circa 1955
1950-1960
1950-1960
1958
1956
1950-1960
1950-1960
1950-1960
1955
1955
2000-100 BCE
1956
1955
1950-1953
1959
circa 1953
1957
1953-1958
1951
1950-1952
1950-1959
1950-1960
1957
1949
circa 1960
1950-1960
1950-1959
1960
1950
1950
1960
1960
1960
1955; 1830
1950