APOH and acute promyelocytic leukemia: Among the phospholipid-binding proteins with anticoagulant functions are proteins C and S. The major antiphospholipid (APL) antibodies include lupus anticoagulant (LA), anticardiolipin antibodies (aCLs), and anti-beta-2-glycoprotein 1 antibodies or apolipoprotein H (APOH).