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.
Artichokes are a simple replacement for a salad, although they take a wee bit longer to prepare. I take the easy, and to my mind tastiest, option. I steam. Unsurprisingly the bigger the artichoke, the longer the steaming time. Anything up to 30 or 40 minutes. The smaller ones normally take around 20 minutes or so. Larger artichokes can be slightly bitter compared to their smaller cousins. You'll need a good inch or so of water to steam.