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.
Fill the pan with just enough water to cover bottom. Bring to a full boil over high heat. While water is heating, trim and discard the stems and tough outer leaves of artichokes. Tuck slivers of butter and slices of garlic into artichoke leaves. When water is boiling, place steamer insert in pot and set artichokes in steamer, stem-side down. Cover pot with lid and allow artichokes to steam for approximately 20 minutes, until tender.