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The Notch signalling pathway is an evolutionarily conserved cell-to-cell communication system utilized multiple times and in many tissues during development. The outcome of an interaction between Notch and its ligands is highly influenced by factors both extrinsic and intrinsic to Notch expressing cells, suggesting that Notch functions either directly or in parallel with other signalling systems to regulate cellular differentiation events. Protein domains common to all ligands and receptors of this system suggest conserved functional properties that likely relate to regulatory mechanisms for Notch signalling. Within this review, the known functional properties of these domains are analyzed with respect to their contributions to ligand/receptor interactions and Notch signalling.
R.J. Fleming (Tue,) studied this question.