serum samples from 64 apparently healthy individuals ( 32 men and 32 women , mean age 81.0 years ) were examined for the prevalence of several autoantibodies , including rheumatoid factor ( rf ) , antinuclear antibodies ( ana ) , antibodies to extracted cellular antigens ro ( ssa ) , la ( ssb ) , sm , u1nrnp and scl-70 .
C0004358
autoantibodies
C0003243
antinuclear antibodies