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Quantitative measurement of the eye pigments (pteridines) extracted from double mutants (ltd1;ca1, g1;ltd1, and rb1;ltd1) and their parental single mutants (ltd1, ca1, g1, and rb1). The eye pigment levels of the wild-type (Oregon-R) and a white-eye mutant (w1118) that lacks eye pigments completely (dashed curves) are included for comparison.
