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Start Over You searched for: Creator Markham, Margaret ✖ Remove constraint Creator: Markham, Margaret Format Text ✖ Remove constraint Format: Text Subject DNA ✖ Remove constraint Subject: DNA Subject Crystallography, X-Ray ✖ Remove constraint Subject: Crystallography, X-Ray Story Section The Discovery of the Double Helix, 1951-1953 ✖ Remove constraint Story Section: The Discovery of the Double Helix, 1951-1953