
Crick and Watson's DNA Molecular Model
1953
1953
1953
1955
1950-1952
1955
1955
1957
1957
1953-1958
1955
1955
circa 1955
1957
1957
1950
1953
1950
1951
1957
1955
1954
1958
1951
1953
1956
1955
1954
1957
circa 1953
1951
circa 1955
1957
1950-1953
1950-1953
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1957
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1951
1955; 1830
circa 1950
1950
1951
1955
1955
1954-1955
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1955
1954
1952