“…The results are readily reproducible and highly specific. Rheumatoid arthritis has been found to be attended by antibodies to nucleoprotein, histone, and whole nucleus (Rothfield and others, 1961;Dorner, Enderlin, Spiegelberg, and Miescher, 1961;Thompson, 1962, Ward, Johnson, andHolborow, 1964); antibodies to nucleoprotein have been found in systemic scleroderma and dermatomyositis (Friou, 1958;Bardawil, Toy, Galins, and Bayles, 1958;Scalettar, Marcus, Simonton, and Muschel, 1960). Positive cell tests have been reported in all these diseases (Kievits, Goslings, Schuit, and Hijmans, 1956;Marmont, 1959;Rothfield and others, 1961).…”