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  1. ; ; ; (, microPublication biology)
    Across species, Epidermal Growth Factor (EGF) family ligands and their receptors participate in developmental and physiological cell-cell signaling events. C. elegans possesses a single EGF receptor, LET-23/EGFR, and two characterized EGF ligands. LIN-3/EGF is well-known for its role in vulval induction, and SISS-1/EGF mediates stress-induced sleep. The C. elegans genome harbors another predicted EGF family member, igeg-2, which has not been characterized. To determine if IGEG-2 is a functional EGFR ligand, we examined whether it can activate known LET-23-dependent processes. We found that ubiquitous overexpression of IGEG-2 promotes both vulval induction and sleep, indicating that it is a functional EGF family ligand. The endogenous role of IGEG-2 remains unknown. 
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    Free, publicly-accessible full text available September 15, 2026