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Klug here referred to his X-ray diffraction studies of crystals of chromatin, the name given to the chromosomal material--an assembly of DNA and a group of simple proteins called histones--when extracted from the nucleus of cells in higher organisms (eukaryotic cells).
Original Repository:
The Wellcome Library for the History and Understanding of Medicine. Francis Harry Compton Crick Papers
Original Repository. Wellcome Library for the History and Understanding of Medicine. Francis Harry Compton Crick Papers. 11646. URL. http://archives.wellcome.ac.uk/