the cat-promoting activity of the early simian virus 40 promoter in plasmid psv2 cat is refractory to methylation by the hpa ii or hha i dna methyltransferase at 5 ' c-c-g-g 3 ' or 5 ' g-c-g-c 3 ' sequences , respectively , because this promoter lacks such sites .
C0025723
methylation
C0012873
dna methyltransferase