Abstract
1. 1. Ultrastructure and Ca-sequestering properties of eye-color pigment granules (PGs) were studied in the eyes of wild type and mutant flies Drosophila melanogaster, Calliphora erythrocephala and Musca domestica. 2. 2. New type of ommochrome PGs localized in primary pigment cells and basal terminals of the processes of Semper cells was found in Drosophila eye. 3. 3. At room temperature these PGs exhibit OsO 4-dependent structural kbility. X-ray microanalysis revealed a less Ca-binding ability of the PGs as compared to those in secondary pigment cells. 4. 4. In the eyes of Musca and Calliphora ommochrome PGs were found to be more stable in respect to Ca removal as compared to Drosophila. 5. 5. Ommochromes provide much more Ca-sequestering ability to PGs than pterins do.
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