measurements of rheumatoid factor ( rf ) and antinuclear antibodies ( ana ) by conventional methods define subpopulations of patients with ra and in a few recent studies an association of human leucocyte antigens ( hla ) undoubtedly indicates the immunogenetic differences in the susceptibility of ra patients with different status of autoantibodies .
C0003243
antinuclear antibodies
C0004358
autoantibodies