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.
Steam your artichokes for less cooking time and to preserve more of their nutrients. 1  Place a couple inches (4 cm) of water into a pot to boil with a steaming basket on top. 2  Drop the artichokes into the pot once the water begins to boil and steam for 15 to 20 minutes. 3  Drain artichokes with the stem up before serving.oil the artichokes for the most traditional method of cooking them. 1  Put a large pot of water on the stove to boil and add salt. 2  Drop the artichokes carefully into the pot once the water begins to boil and leave them to cook for 30 to 45 minutes.