Argus Panoptes
Argos is secreted from cells in "D. melanogaster". Outside the cell, it binds the EGFR-activator Spitz, preventing it from binding and activating EGFR. "Drosophila" with mutations that inactivate Argos have deformed eyes with extra photoreceptors and a small optic lobe due to disruption of EGFR's role in eye development. The name of the gene derives from the phenotype of mutant flies with eye defects and refers to Argus Panoptes.