Properdin factor a
properdin factor A n.
A component of the properdin system that is a hydrazine-sensitive form of beta-globulin and the third component of complement.
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- Properdin factor b
properdin factor B n. A normal serum protein and a component of the properdin system.
- Properdin factor d
properdin factor D n. A normal serum alpha-globulin required in the properdin system.
- Properdin factor e
properdin factor E n. A serum protein required for activation of the third component of complement.
- Properdin system
properdin system n. An alternative system by which, in the absence of antibodies bound to immunoglobulins and components of complement, the immunological cascade occurs, with the activation of critical components of complement aided by the stabilizing properties of properdin.
- Proper fasciculus
proper fasciculus prop·er fasciculus (prŏp’ər) n. Any of several ascending and descending association fiber systems of the spinal cord that lie deep in the funiculi adjacent to the gray matter. Also called ground bundle.