If you thought Notch was always a receptor, think again! In this paper, Notch was found to function as a _ligand_ for Draper, a phagocytic receptor.
#Drosophila
www.nature.com/articles/s41...
Here they show that, in Drosophila testes, Notch functions as a ligand to activate Draper-dependent signalling in neighboring phagocytes and eliminate germline progenitors, revealing Reverse Notch sig...