The double helical structure of DNA, 3D animation with no audio
Based on available data from X-ray diffraction patterns and 3D conceptualization through model building, Watson and Crick proposed that DNA is a double helix "a twisted ladder" with two phosphate-based backbones and "runged" nucleotides that pair.
(DNAi Location: Code > Finding the Structure > Putting it together > Base pairing interactive)
Animation of 2D DNA model becoming three dimensional.
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