James Dewey Watson Francis Harry Compton Crick http: //www. nlm. nih. gov/visibleproofs/galleries/technologies/dna_image_7. html and http: //biology. plosjournals. org/perlserv/? request=get-document&doi=10. 1371%2 F journal. pbio. 0020419&ct=1
http: //www. pbs. org/wgbh/nova/photo 51/anat-flash. html