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The two families of dipteran glutathione S-transferases (GST-1 and GST-2) were located separately by immunohistology on sections of adult houseflies. GST-1 was distributed in haemolymph cells, whereas GST-2 was found in the indirect flight muscles of the thorax and in the central nervous system. In the muscles, the distribution of GST-2 seemed to be uniform in cells, whereas in the brain and the thoracic...