A comparative analysis was made for the fatty acid composition of lipids in the malignant muscular tissue, muscle and liver under blastomogenesis induced in mice by the Moloney sarcoma virus and 3-methylcholanthrene. The relation of the found changes in the fatty acid composition to the blastomogenesis stages is shown. The development of the tumour node is accompanied by a decrease of the fatty acid amount in the animal tissues and by its increase in the tumour. A spontaneous regression of the Moloney sarcoma results in increased level of the fatty acid content in the animal tissues followed by its normalization.
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