A fusion protein, the sequence of which, commencing at the N-terminus of the fusion protein, is identical to the sequence of amino acids in:
- (a) an extracellular domain of a human Notch1 receptor protein, followed by
- (b) an Fc portion of an antibody,
- wherein the extracellular domain of the human Notch1 receptor protein
- (i) commences with the amino acid present at the N-terminus of EGF-like repeat 10 and
- (ii) extends to and includes the C-terminal amino acid of EGF-like repeat 18 as the C-terminal amino acid of the extracellular domain.