
Crick and Watson's DNA Molecular Model
1953
1953
1953
1955
1955
1955
1955
circa 1955
1953
1955
1954
1953
1956
1955
1954
circa 1953
circa 1955
1956
1955
1955; 1830
1955
1955
1954-1955
1952
1955
1954
1952
1955
1954
1952
1954
1956
1956
1952
1954
1956
1953
1956
1956
2000-100 BCE
1953
1955
May 1953
circa 1955
1955
circa 1953
1955
1903 (original); 1982 (model)
1954
1955
1954