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 for 30 minutes until artichoke bottom is tender (test with a fork) or when leaves are softened. Remove artichoke and drain water completely. Depending on your stuffing/filling recipe, you may want to cool the artichoke first, either in room temperature or in the refrigerator.team artichoke before stuffing. Stand artichoke upright in a pot filled with 2 water. Add a pinch of salt and/or a few drops of lemon juice, if desired. Bring water to a boil and then turn heat down to low. Cover, and steam. Check pot water level every 10 minutes when steaming, refill if needed.