Abstract
The involvement of corpora allata and juvenile hormone [JH] in vitellogenin synthesis in the cecropia silkworm was examined. Allatectomy of diapausing pupae did not alter the pattern of 3H-leucine incorporation into vitellogenin during their late pharate adult development. Allatectomy of early 4th and 5th instar caterpillars did not prevent the appearance of vitellogenin in these operated animals when they had transformed into miniature pupae or pupal-adult intermediates. Injection of a synthetic dl-JH into isolated diapausing abdomens did not stimulate the incorporation of 3H-leucine into vitellogenin. Corpora allata and JH are not required for the initial appearance and synthesis of vitellogenin in the cecropia silkworm.

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