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 the pot with the lid and let Artichokes cook at a high simmer on stove until they are tender. Cooking time can vary, depending on the size of the Artichokes. A good approximation is 30 minutes for a Medium-sized Artichoke or 45 minutes for a Jumbo-sized Artichoke.rep Time: 5 mins Cook Time: 30 mins. Boiling fresh Artichokes is one of the original and classic ways to cook the veggie. Plus, a lot of restaurants still use this method today! Bring a large pot of salted water to a boil.