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Fig. 3. The increase in pteridine content (intensity averaged over all individuals
of an age class, ± 2 s.e.m.; for N values, see Materials and
methods) with known age in laboratory-reared D. serrata females (A)
and males (B). Linear regressions though the average values for each sex
displayed here indicated that pteridine content was closely associated with
age in females (r2=0.917, F1,16=175.8,
P<0.001) and males (r2=0.760,
F1,15=47.6, P<0.001).