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Coagulation factor IX compositions and methods of making and using same

  • US 9,376,672 B2
  • Filed: 05/12/2015
  • Issued: 06/28/2016
  • Est. Priority Date: 08/24/2009
  • Status: Active Grant
First Claim
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1. A factor IX fusion protein comprising a factor IX polypeptide and an extended recombinant polypeptide (XTEN), said XTEN comprising an amino acid sequence having at least 90% sequence identity to a sequence selected from SEQ ID NOs:

  • 35, 36, 37, 38, 43, 44, 45, and 46, wherein the XTEN is characterized in that;

    (a) the sum of glycine (G), alanine (A), serine (S), threonine (T), glutamate (E) and proline (P) residues constitutes more than 80% of the total amino acid residues of the XTEN; and

    (b) the XTEN is non-repetitive such that (i) the XTEN contains no three contiguous amino acids that are identical unless the amino acids are serine, or (ii) at least 80% of the XTEN comprises non-overlapping sequence motifs, each of the sequence motifs comprising about 9 to about 14 amino acid residues, wherein any two contiguous amino acid residues do not occur more than twice in each of the sequence motifs.

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