Figure 4. The lifespan extension induced by thymine depends on reproductive signals. (A–D) Lifespan analysis of (A) glp-1 (e2144), (B) daf-2 (e1370), (C) sir-2.1 (ok434), and (D) eat-2 (ad1116) animals treated with 2 mM thymine (red) and vehicle (black), on heat-inactivated E. coli OP50 (log-rank test). Lifespan values of replicated experiments are summarized in