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Dipeptidyl peptidase IV (DPPIV) has beenimplicated in the control of cell growth anddifferentiation. A rat hepatocyte membrane antigenrecognized by a monoclonal antibody (HAM.4) has now beenshown to be identical to DPPIV by immunoblot analysisand amino acid sequencing. The amounts of DPPIVimmunoreactive protein and enzymatic activity in serumincreased in a manner independent of de novo proteinsynthesis,...