Acute Disease, Adenoviridae, Animals, Apoptosis, Arthritis, Reactive, B-Lymphocytes, Chronic Disease, Disease Models, Animal, Fas Ligand Protein, Genetic Therapy, Lymph Nodes, Male, Membrane Glycoproteins, Mice, Mice, Mutant Strains, Mycoplasma Infections, Synovial Membrane, T-Lymphocytes