
Crick and Watson's DNA Molecular Model
1953
1953
1953
1955
1951
1953
1955
1951-1953
1953
1952-3
circa 1955
1952
1954
1952
1954
1952
1954
1952
circa 1955
1955
1951
1955
1951-1953
1955
1955
1955
1953
1955; 1830
1954
1951
1954
1951
1951
May 1953
1955
1955
1954
1951
1938 and 1951
2000-100 BCE
1951
1953
1955
1955
1951
1955
1954-1955
circa 1953
1954
1955
1954