Figure 2.

PBA extends lifespan whether fed early or late in life. Newly emerged w¹¹¹⁸ flies were fed on medium plus 10 mM PBA for 12 days, then transferred to normal medium for the rest of their lifespan. Converse group was fed on normal medium for the first 12 days, then with PBA for the remainder of life. Arrows indicate day 12. Each initial population was 200 flies. (a) Virgin females; (b) males.