
Crick and Watson's DNA Molecular Model
1953
1953
1953
1955
1957
1955
1955
1951
1830 (original); 1967 (model)
circa 1955
1958
1956
1955
1955
2000-100 BCE
1956
1955
circa 1953
1957
1953-1958
1951
1957
1955; 1830
1957
1952
1955
1954
1952
1955
1957
1954
1952
1954
1957
1956
1957
1956
1957
1952
1954
1957
1951
1951-1953
1938 and 1951
May 1953
1951
1957
1955
1957
1953
1951