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Human ChromosomeSomatic CellChinese HamsterChinese Hamster OvaryHuman ChromosomesSomatic Cell HybridHybrid CellChromosomeHybrid CellsCell LineCHO CellsHypoxanthine PhosphoribosyltransferaseX ChromosomeAdenine PhosphoribosyltransferaseEthyl Methanesulfonatein Situ HybridizationMouseResistant MutantsOvary CellsChinese Hamster Ovary Cells