title: The molting hormones from the embryonated EGG of the tobacco hornworm, Manduca sexta (l.).
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.
mesh_terms: D000818:Animals; D002855:Chromatography, Thin Layer; D004440:Ecdysone / Q000032:analysis*; D004625:Embryo, Nonmammalian / Q000032:analysis*; D005260:Female; D007313:Insecta / Q000032:analysis*; D009682:Magnetic Resonance Spectroscopy; D010063:Ovum / Q000032:analysis*
chemical_list: D004440:Ecdysone