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Paralytic/GBP/PSP peptide This family includes insect peptides that are short (23 amino acids) and contain 1 disulphide bridge. The family includes growth-blocking peptide (GBP) of Pseudaletia separata and the paralytic peptides from Manduca sexta, Heliothis virescens, and Spodoptera exigua as well as plasmatocyte-spreading peptide (PSP1). These peptides function to halt metamorphosis from larvae to pupae.
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