Patent ID: 7141663

Claim:
An isolated nucleic acid molecule selected from the group consisting of: a) an isolated nucleic acid molecule encoding the amino acid sequence set forth in SEQ ID NO:2, wherein the amino acid residue at position 26 of SEQ ID NO:2 is any amino acid except for leucine, or a complement thereof; b) an isolated nucleic acid molecule comprising the nucleotide sequence set forth in SEQ ID NO:1, wherein the nucleic acid molecule comprises one or more nucleic acid modifications as compared to the nucleotide sequence set forth in SEQ ID NO:1 such that nucleotide residues 176–178 of SEQ ID NO:1 encode any amino acid except leucine, or a complement thereof; c) an isolated nucleic acid molecule comprising the nucleotide sequence set forth in SEQ ID NO:1, wherein the nucleic acid molecule comprises one or more nucleic acid modifications at nucleotide residues 176–178 of SEQ ID NO:1 such that nucleotide residues 176–178 of SEQ ID NO:1 encode any amino acid except leucine, or a complement thereof.