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.
Wash artichokes under cold, running water. Pull off lower petals and cut off bottom stems (cut flush with the base). Cut off about 1/2 inch of the pointed top of the artichoke. Trim tips of leaves with scissors to remove thorns.Dip in lemon juice to preserve color. How To Cook Artichokes: Cooking time depends on how large the artichoke is-the larger the artichoke, the longer it takes to cook.ow To Prepare Artichoke Hearts: Into a large bowl, squeeze the juice of 1 lemon into 1 quart of the water. As you prepare and cut your artichokes, dip them into the lemon/water to prevent discoloring (oxidizing). Using a sharp knife, cut the stems off of the artichokes even with the bottoms.