Abstract
Expression of a 54 kDa tyrosyl phosphorylated protein in epidermal cells during the third instar larval stage was followed. It was demonstrated that the 54 kDa protein moiety and its phosphorylated counterpart follow the same developmental profile. The system seems to be regulated only at the onset of the second moult, by an initial signal which regulates both the synthesis and phosphorylation of a 54 kDa protein. The continuous presence this protein in epidermal cells during the third instar stage, as well as during apolysis and histolysis, suggests that it might participate in cell activities taking place during this developmental period. However, the 54 kDa protein could no be involved in specific epidermal cell activities such as histolysis, melanization and sclerotization, since these activities occur only at specific times during the third instar stage.
Published Version
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