Fig. 1: dNTPs used in telomerase reactions.
From: Mechanisms of telomerase inhibition by oxidized and therapeutic dNTPs

a Chemical structures of dNTP analogs used in this study and the corresponding natural dNTP shown in the same color. b Telomerase catalytic cycle. Blue indicates the telomerase RNA template; black indicates DNA primer; red indicates newly added nucleotides; numbers represent the steps in the cycle.