They are essential in B cell antibody class switching, in the activation and growth of cytotoxic T cells, and in maximizing bactericidal activity of phagocytes such as macrophages. Mature T h cells express the surface protein CD4 and are referred to as CD4+ T cells.Such CD4 + T cells are generally treated as having a pre-defined role as helper T cells within the immune system.hey are essential in B cell antibody class switching, in the activation and growth of cytotoxic T cells, and in maximizing bactericidal activity of phagocytes such as macrophages. Mature T h cells express the surface protein CD4 and are referred to as CD4+ T cells.
To boil artichokes: 1  Fill a large stainless-steel or enameled pot with lightly salted water; bring to boiling. 2  Add artichokes and return water to boiling. 3  Reduce heat; simmer, covered, for about 20 to 30 minutes or until you can easily pull out a leaf from the center of an artichoke.
It's easier to cut a fresh artichoke in half to cut out the choke, or cook it first and then hollow it out. The heart, the best part, is under the choke. If artichokes are cooked, the choke can be removed with the tip of a knife. Try to leave as much of the heart as possible.* : Clean and trim artichokes and put them upside-down in a steamer basket. Steam from 45 minutes to 1 hour, until they can be pierced easily with a fork.ICROWAVE: Put 1 to 4 cleaned artichokes upside down (or right side up, whatever) in a microwave-safe bowl; add 1/4 inch water. Cover tightly with a lid, plastic wrap or plate. Cook 4 minutes, then let them sit 4 minutes. Check for doneness.