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 Wash artichokes and peel off tough outer leaves. 2  Cut off stems and tough tops. 3  Immerse peeled artichokes in a bowl of water mixed with lemon juice to prevent oxidation. 4  Youâll get 2 lbs (1 kg) of peeled artichokes. 5  Pour 2 pints (1 liter) of water in a pot, add salt, sugar, vinegar, olive oil and bring to a boil. Youâll get 2 lbs (1 kg) of peeled artichokes. 2  Pour 2 pints (1 liter) of water in a pot, add salt, sugar, vinegar, olive oil and bring to a boil. 3  Drop in artichokes and boil for 5 minutes. 4  Line the bottom of glass jars with garlic cloves, parsley and celery. 5  Stuff the jars with hot artichokes.