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.
Prep Time: 5 mins Cook Time: 40 Minutes. First, place a steaming basket in a large pot and fill the pot with water until it reaches just under the basket. Place one layer of rinsed and trimmed Artichokes into the steaming basket with Artichoke stems facing up; cover with lid.On high heat, bring the water in the steaming pot to a boil.Steam Artichokes 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: 40 Minutes. First, place a steaming basket in a large pot and fill the pot with water until it reaches just under the basket. Place one layer of rinsed and trimmed Artichokes into the steaming basket with Artichoke stems facing up; cover with lid.