Abstract
Precocene II, added to the meal of fourth-instar larvae of Rhodnius prolixus (25 micrograms/ml of blood), induced an increase in the duration of the molting cycle. This effect was related to the decrease of both the nuclear area of the prothoracic gland cells and the mitotic activity in epidermal cells. Juvenile hormone analogue applied topically (60 micrograms/insect) together with Precocene II treatment avoided atrophy of the prothoracic glands and induced a higher number of epidermal mitosis accelerating the time of subsequent ecdysis. A possible relationship between juvenile hormone and production of ecdysone is discussed.
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