Abstract

Phosphorylation of ribosomal protein S6, induced when the fat body of Sarcophaga peregrina (flesh-fly) larvae was incubated in vitro in the presence of 32P, was found to be suppressed by juvenile hormone. This suppressive effect of juvenile hormone was counteracted by a physiological concentration of 20-hydroxyecdysone. Since 20-hydroxyecdysone is known to induce phosphorylation of S6 in vivo, this reaction was suggested to be regulated by the balance of the effects of ecdysone and juvenile hormone.

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