Whole human female metaphase chromosome from metaphase arrested cell swollen in hypotonic medium, and treated to remove histones. The residual 'scaffold' was imaged with high voltage EM at 1 MeV. This image was taken with a specimen tilt of 54 degrees. Grouped with it is an image of the same area at 46 degrees tilt, providing an oblique stereo view of the chromosome.
HeLa cells were metaphase-arrested by a 3hr treatment with colcemid, the cells mechanically broken by passage through a 22-gauge needle and exposed to hypotonic 75 mM KCl, treated to remove histones, spread on a water surface, fixed with formaldehyde, picked up on formvar coated grid, critical point dried, and imaged with the Wisconsin HVEM at 1 MeV. See Ris (1978) Preparation of chromatin and chromosomes for electron microscopy. Meth Cell Biol 18:229-246; Ris (1981) Stereoscopic microscopy of chromosomes. Meth Cell Biol 22:77-96.
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