Image caption on page 125 of the book US National Library of Medicine: "Interior view of the roof, looking up from the library's rotunda, November 2016. The fifteen-foot long sculpture suspended from the ceiling represents the atomic constituents of DNA. A complete DNA molecule on the scale of this model would be 142 miles long. This sculpture was originally displayed in a 1969 exhibition on the work of Marshall W. Nirenberg, PhD, the National Institutes of Health research biochemist who, with his colleagues Har Gobind Khorana and Robert W. Holley, received the 1968 Nobel Prize in Physiology or Medicine, for breaking the genetic code, discovering how sequences of DNA--known as 'triplets--direct the assembly of amino acids into the structural and functional proteins essential to life. Courtesy of Stephen J. Greenberg."
The National Library of Medicine believes this item to be in the public domain. (More information)