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Watson and Crick's first model of DNA

Image caption:
Watson and Crick's model erroneously placed the bases on the outside of the DNA molecule with the phosphates, bound by magnesium or calcium ions, inside.

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Image credit:
If you use this image in your own non-commercial project please credit it to the University of California Museum of Paleontology's Understanding Science (http://www.understandingscience.org).

 


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