subject: _:node4a51a71a3352bb2cc924ab3242e743ce
obj: "Notch proteins (so named for 'notches' in fly wings) are type I transmembrane glycoproteins involved in specifying cell fates and defining boundaries between different cell types during developmental processes. Notch extracellular domains are large, having 34-36 EGF-like repeats followed by three notch/Lin-12 repeats.  Notch proteins interact with transmembrane ligands Jagged, Delta, and Serrate expressed on the surface of a neighboring cell. Upon ligand binding, a series of cleavage events results in the release of the Notch intracellular domain (NICD), which translocates to the nucleus and initiates transcription of Notch-responsive genes. Thus, Notch acts as both a ligand-binding receptor and a nuclear factor that regulates transcription. "