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Introduction: Antithrombin (AT) and heparin cofactor II (HCII) are plasma glycoproteins and serpins that inhibit thrombin. We showed [Blood 86 (1995) 3461] that recombinant rabbit AT containing the Utah mutation of AT, P407L, was inefficiently secreted by transfected primate and rodent cultured cells. In the current study, the effects of P407L and related substitutions in human AT and human HCII were...