Double helix DNA model. plastic, stainless steel tube, wire, 15 ft., made by A. A. Barker, Cambridge, UK, 1969. This sculpture suspended from the ceiling of the NLM's rotunda, was originally displayed in a 1969 exhibition on the work of Nobel laureate Dr. Marshall W. Nirenberg. It represents the atomic constituents of DNA: hydrogen [white], oxygen [red], nitrogen [blue], carbon [black], phosphorus [purple]. A complete DNA molecule on the scale of this 15-foot-high model would be 142 miles long. Photo: J. D. Talasek.
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