The technique to which Crick referred here was invented by Arthur Hughes, a technique by which small particles of magnetic ore were inserted into cultured chick fibroblast cells. The cells engulfed the particles, which could then be moved around inside the cells by an applied magnet field, yielding data on the physical properties of the cytoplasm, the material of the cell that surrounds the nucleus. Crick described and analyzed the results obtained from these experiments in two papers, mentioned here as drafts and published in 1950, his first published papers.. More importantly for his scientific career in the long term, Crick in this note declared his intention to transfer to the Medical Research Council's unit at the Cavendish Laboratory in order to study the structure of proteins with Max Perutz.
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