because of their increased specific activity of dihydrofolate reductase , the cells were able to maintain normal dna metabolism , as measured by the ratio of the incorporation rates of 3h-deoxyuridine and 3h-thymidine , as well as normal cell growth at 1 x 10 ( -6 ) m , and in some cases at 1 x 10 ( -5 ) m triamterene .
C0007634
cells
C0007595
normal cell growth