Monocytes/macrophages actively regulate both the assembly and function, as well as the substrate specificity, of various coagulation enzymes at their membrane surface. Regulation is effected through a variety of mechanisms, not limited to, but including the expression of receptors (or ‘binding sites’) for the various protein constituents of the complexes, the expression of different receptors which may alter the function of the protease, and the expression of membrane proteases which may affect protein cofactor function. Monocyte stimulation with various agonists modulates many of these responses as does their adherence to and differentiation on various substra