chromosome-mediated gene transfer ( cmgt ) of the human genes for hypoxanthine phosphoribosyl transferase ( hprt ) and cytosol thymidine kinase ( tk1 ) into hprt deficient mouse a9 cells or tk deficient swiss mouse 3t3tk- cells was found to occur at frequencies at least one order of magnitude higher than dna-mediated gene transfer ( dmgt ) .
C1522555
cytosol thymidine kinase
C1420747
tk1