Abstract
Tryptophan pyrrolase activity was assayed in the haemolymph and fat bodies of adult female and male desert locusts of different ages. In the haemolymph, tryptophan pyrrolase activity was found only in females with developing oöcytes. In the fat body, tryptophan pyrrolase activity was always found in the female, but in males it was only present during the first 10 days of adult life. Analysis of DNA, RNA, and protein provided strong evidence that in the female the fat body was engaged in protein systhesis during oöcyte development; in males there was an accumulation of protein in the fat body during maturation.
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