Abstract
Hemolymph ecdysone titers were measured by radioimmunoassay at the different molt stages. One major peak was found at stage D1‴–D2 and a minor peak at stage B. Minima were found at stages A and C3–C4. No sex differences were found. Ecdysone levels were followed in individual animals over a period of days, and transitory high values, each followed by a return to low values, were found during premolt. It is suggested that ecdysone may be produced intermittently for precise control of premolt developmental changes.
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