Autoantibodies Ani Ro and Anti La are completely absent
in
Systemic Lupus erythematosus
Sjogren's syndrome
Diffuse Scleroderma
Rheumatoid arthritis
Decreasing order of frequency of finding Anti - Ra (or SSa) & Anti- La (or SSb) antibodies is Sjogren's syndrome, SLE, Systemic sclerosis. SSa antibodies may be occasionally found but SSb antibodies may be totally absent in rheumatoid arthritis.