A gamma-globulin factor in the serum of patients with systemic lupus erythematosus that reacts with isolated cell nuclei 1 or nucleoprotein 2,3 has been detected in many ways. 4 The standard method of ...

Complement component 3, often called C3, is an essential protein of the immune system. This protein plays a vital role in the body’s innate immune system, providing: the first line of defense against ...

THE antigen most commonly used in complement fixation tests for Johne's disease is a suspension of the specific organism, Mycobacterium johnei. This form of antigen is not entirely satisfactory for ...