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.
1 Bring about 1/2 inch water to a boil in a pan deep enough to hold the artichoke(s) standing up. 2  Add a teaspoon or two of salt (the artichoke will just be sitting it in, not submerged). 3  Set artichokes in the salted boiling water, cover the pan, reduce heat to maintain a steady simmer, and cook 20 minutes.tove-Top Steaming: The true boiling water and moisture maintained by steaming artichokes on the stove-top more than makes up for the extra time it takes, in my opinion. 1  Bring about 1/2 inch water to a boil in a pan deep enough to hold the artichoke(s) standing up.