title: Hidden rheumatoid factor in seronegative juvenile rheumatoid arthritis.
mesh_terms: D000293:Adolescent; D000974:Antibodies, Antinuclear / Q000032:analysis; D001171:Arthritis, Juvenile / Q000276:immunology*; D002648:Child; D002675:Child, Preschool; D002850:Chromatography, Gel; D005260:Female; D006801:Humans; D007074:Immunoglobulin G / Q000032:analysis; D007075:Immunoglobulin M / Q000032:analysis; D007841:Latex Fixation Tests; D008297:Male; D012217:Rheumatoid Factor / Q000032:analysis*
chemical_list: D000974:Antibodies, Antinuclear; D007074:Immunoglobulin G; D007075:Immunoglobulin M; D012217:Rheumatoid Factor