The present invention is directed to a polypeptide (for example, an antigen-binding molecule) that comprises a polypeptide portion of a deimmunized serum-binding protein capable of binding to said serum protein. The presence of the serum-binding protein extends the serum half-life of the polypeptide, relative to the serum half-life of the polypeptide if lacking the polypeptide portion of the deimmunized serum-binding protein. The invention also pertains to methods and uses that employ such molecules.
