X-ray diffraction patterns of DNA by Florence Bell in her Ph.D. thesis (1939) were similar to (although not as good as) "photo 51", but this research was interrupted by the events of World War II.
Sikut difraksi sinar-X DNA olih Florence Bell ring Ph.D. tesis (1939) mesib sareng (yadiastun nénten sabecik) "gambar 51", sakéwanten seseleh puniki kagulgul olih pamargin Perang Dunia II.