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Fig. 9. Histamine is reduced in the heads of four fly species with white eyes.
These are: Sarcophaga spp., combined data from two species that
compare S. bullata (wild-type) with S. barbata (mutant
ivory, with white eyes); Calliphora erythrocephala (wild-type) with
chalky (white eye); Musca domestica (wild-type and
white-eyed); and Drosophila melanogaster, white null mutant
and O-R wild-type.