Fludarabine triphosphate (F-ara-ATP) trisodium, the principal metabolite of Fludarabine, acts as a potent, noncompetitive, and specific inhibitor of DNA primase, exhibiting an IC50 value of 2.3 μM and a Ki of 6.1 μM. It hampers DNA synthesis by obstructing DNA primase and the formation of primer RNA, while also inhibiting ribonucleotide reductase and DNA polymerase activities, effectively inducing cellular apoptosis [1] [2].