The molting hormones from the embryonated egg of the tobacco hornworm, Manduca sexta (L.) |
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Authors: | J.N. Kaplanis W.E. Robbins M.J. Thompson S.R. Dutky |
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Affiliation: | Insect Physiology Laboratory, Plant Protection Institute Agricultural Research Service, U. S. Department of Agriculture Beltsville, Maryland 20705 |
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Abstract: | 26-Hydroxyecdysone is the predominant molting hormone in 24- to 44-hour-old embryonated tobacco hornworm eggs, accounting for approximately 80% of the ecdysones present at this stage of development. This molting hormone was previously shown to be the major ecdysone present in 48- to 64-hour-old embryonated eggs of this insect. During both of these periods of embryonic development in the hornworm 20-hydroxyecdysone is a minor component, in contrast to its presence as the major ecdysone in the hornworm during certain stages of post-embryonic development. |
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