Patent ID: 7115710

Claim:
An isolated or purified polypeptide comprising an amino acid sequence having (a) the full length amino acid sequence set forth in SEQ BY NO:5, SEQ ID NO:6, or SEQ ID NO:7; (b) the full length amino acid sequence of the sequence set forth in SEQ ID NO:5, SEQ ID NO:6, or SEQ ID NO:7, except that it lacks one or more of the following segments of amino acid residues: 1-187 and 421-426 of SEQ ID NO:5, 44-80 and 458-463 of SEQ ID NO:6, or 1-87 and 406-412 of SEQ ID NO:7, wherein said polypeptide has tyrosine phosphatase activity; (c) the amino acid sequence set forth in SEQ ID NO:5, SEQ ID NO:6, or SEQ ID NO:7 from amino acid residues 188-420 of SEQ ID NO:5, 225-457 of SEQ ID NO:6, or 188-405 of SEQ ID NO:7, wherein said polypeptide has tyrosine phosphatase activity; or (d) the full length amino acid sequence set forth in SEQ ID NO:5, SEQ ID NO:6, or SEQ ID NO:7 except that it lacks one or more of the domains selected from the group consisting of an N-terminal domain and C-terminal domain, wherein said polypeptide has tyrosine phosphatase activity.