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C-type virusa type of RETROVIRUS that infects mammals and birds. Certain variants, that are defective in REPLICATION and in which part of the GENOME has been replaced by an ONCOGENE, can induce TUMOUR formation in the host.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005