Figure 1

Pterin relative fluorescence (in thousands) of female and male P. downsi adults held under laboratory conditions until death at specified ages. Linear regression for females: Relative fluorescence = 0.21*Age + 18.46; r2 = 0.7462; p < 0.001. Linear regression for males: Relative fluorescence = 0.13*Age + 20.71; r2 = 0.6741; p < 0.001.