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.
Boiling artichokes. 1. Boil 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.3  Drain artichokes with the stem up before serving.oiling artichokes. 1. Boil 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.