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The proteins on metaphase chromosomes theoretically may be distributed ubiquitously throughout the karyotype, may be present uniquely on individual chromosomes or classes of chromosomes, or may exist in any combination of the above. Separation of chromosomes according to size using sucrose velocity gradients in high capacity zonal centrifuge rotors allows sufficient fractionation of the genome to indicate the distribution of proteins within the karyotype. Flow cytometric analysis and direct microscopic analysis were used to evaluate qualitatively the types of chromosomes present in the fractions obtained. This report is the first quantitative evidence that some of the chromosomal proteins are not distributed ubiquitously on all of the chromosomes of the karyotype.

Isolated metaphase chromosomes. II. Proteins of Chinese hamster chromosomes.