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.
Cover. Bring to a boil and reduce heat to simmer. Cook for 25 to 45 minutes or until the outer leaves can easily be pulled off. Note: artichokes can also be cooked in a pressure cooker (about 15-20 minutes cooking time). Cooking time depends on how large the artichoke is, the larger, the longer it takes to cook. Rinse the artichokes in running cold water. While you rinse them, open up the petals a little so that the water does get inside more easily. 6 In a large pot, put a couple inches of water, a clove of garlic, a slice of lemon, and a bay leaf (this adds wonderful flavor to the artichokes). Insert a steaming basket.