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Figure 7


Fig. 7. Histamine in the head is altered reciprocally by white, in double mutants with ebony and tan. In all single mutants, the histamine content is reduced, to 51% (white), 48% (ebony) and 10% (tan) of the wild-type value. Relative to these, double-mutant white, tan has significantly more histamine than the corresponding tan single mutant ({dagger}P<0.0005), which has 34% of the wild-type value; whereas white; ebony has less head histamine than either single mutant alone, reduced to 19% of the wild-type value, a reduction that is significant (*P<0.0005).